update +++

backups2smb.sh

@@ -11,7 +11,14 @@ TMP_BACKUP="/tmp/$BACKUP_NAME"
 CHUNK_SIZE="10G"
 MIN_SPACE_REQUIRED="5G"  # Minimum space required in /tmp
 LOG="/var/log/pbs-smb-backup.log"
-SRC="/etc /root /mypool"
+SRC="/mypool /etc"  # Only scan these directories
+DB_DIR="/var/lib/pbs-backup"
+DB_FILE="$DB_DIR/index.db"
+
+# Global variables for cleanup
+CLEANUP_IN_PROGRESS=0
+MONITOR_PID=0 # No longer used for background monitor, kept for potential future use
+CURRENT_SCAN_DIR=""
 
 # Exclusion patterns
 EXCLUDE_PATTERNS=(
@@ -58,7 +65,577 @@ EXCLUDE_PATTERNS=(
     "*.vswp"
 )
 
-MAX_BACKUPS=3  # Keep exactly 3 backups
+# Build find command exclusions
+build_find_exclusions() {
+    # Create a temporary file with exclusion patterns
+    local exclude_file="$TMP_BACKUP/exclude_patterns.txt"
+    printf "%s\n" "${EXCLUDE_PATTERNS[@]}" > "$exclude_file"
+    
+    # Build the find command with optimized exclusions
+    echo "-type f -not -path '*/\.*' -not -path '*/node_modules/*' $(printf -- "-not -name '%s' " "${EXCLUDE_PATTERNS[@]}")"
+}
+
+# Function to handle script termination
+handle_termination() {
+    local signal=$1
+    local exit_code=$2
+    
+    # Prevent multiple cleanup attempts
+    if [ "$CLEANUP_IN_PROGRESS" -eq 1 ]; then
+        exit $exit_code
+    fi
+    CLEANUP_IN_PROGRESS=1
+    
+    # Clear the current line before printing cleanup message
+    echo -ne "\r\033[K"
+    echo "[$(date)] ⚠️ Received signal $signal. Cleaning up..." | tee -a "$LOG"
+    
+    # Kill background processes (No background monitor anymore, but clean up potential child find/stat processes)
+    # We can add more specific process killing here if needed later
+    pgrep -P $$ | xargs -r kill
+    
+    # Cleanup temporary files
+    if [ -d "$TMP_BACKUP" ]; then
+        echo "[$(date)] Cleaning up temporary files..." | tee -a "$LOG"
+        rm -rf "$TMP_BACKUP"
+    fi
+    
+    # Unmount share if mounted
+    if mountpoint -q "$MOUNT_POINT"; then
+        echo "[$(date)] Unmounting share..." | tee -a "$LOG"
+        cleanup_processes "$MOUNT_POINT"
+        unmount_share
+    fi
+    
+    # If it was a Ctrl+Z, kill the script
+    if [ "$signal" = "SIGTSTP" ]; then
+        echo "[$(date)] ❌ Script terminated by Ctrl+Z" | tee -a "$LOG"
+        kill -9 $$
+    fi
+    
+    # For Ctrl+C, exit gracefully
+    if [ "$signal" = "SIGINT" ]; then
+        echo "[$(date)] 👋 Script terminated by Ctrl+C" | tee -a "$LOG"
+        exit $exit_code
+    fi
+}
+
+# Set up signal handlers
+trap 'handle_termination SIGINT 130' SIGINT
+trap 'handle_termination SIGTSTP 146' SIGTSTP
+trap 'handle_termination EXIT $?' EXIT
+
+# Function to process a batch of files
+process_file_batch() {
+    local batch_file="$1"
+    local db_file="$2"
+    local temp_sql="$TMP_BACKUP/temp_$(basename "$batch_file").sql"
+    local batch_num=$(basename "$batch_file" | sed 's/batch_//')
+    
+    echo "[$(date)] 📦 Processing batch $batch_num..." | tee -a "$LOG"
+    
+    # Create SQL file with all inserts
+    echo "BEGIN TRANSACTION;" > "$temp_sql"
+    local count=0
+    while read -r file; do
+        ((count++))
+        # Get file metadata
+        local size=$(stat -c %s "$file" 2>/dev/null)
+        local mtime=$(stat -c %Y "$file" 2>/dev/null)
+        local hash=$(md5sum "$file" 2>/dev/null | cut -d' ' -f1)
+        
+        # Show file being processed every 100 files
+        if ((count % 100 == 0)); then
+            echo "[$(date)] 📄 Processing: $file (${size} bytes)" | tee -a "$LOG"
+        fi
+        
+        # Escape single quotes in file path
+        file=$(echo "$file" | sed "s/'/''/g")
+        
+        # Add to SQL file
+        echo "INSERT OR REPLACE INTO file_index (path, size, mtime, hash, file_exists) VALUES ('$file', $size, $mtime, '$hash', 1);" >> "$temp_sql"
+    done < "$batch_file"
+    echo "COMMIT;" >> "$temp_sql"
+    
+    echo "[$(date)] 💾 Writing batch $batch_num to database ($count files)..." | tee -a "$LOG"
+    # Execute SQL file
+    sqlite3 "$db_file" < "$temp_sql"
+    rm -f "$temp_sql"
+    echo "[$(date)] ✅ Completed batch $batch_num" | tee -a "$LOG"
+}
+
+# Function to check and update database schema
+check_and_update_schema() {
+    echo "[$(date)] 🔍 Checking database schema..." | tee -a "$LOG"
+    
+    # Check if scan_time column exists
+    if ! sqlite3 "$DB_FILE" "SELECT scan_time FROM file_index LIMIT 1;" > /dev/null 2>&1; then
+        echo "[$(date)] ⚠️ Database schema needs update. Adding scan_time column..." | tee -a "$LOG"
+        
+        # Create backup of current database
+        local backup_file="${DB_FILE}.bak.$(date +%s)"
+        cp "$DB_FILE" "$backup_file"
+        echo "[$(date)] 📦 Created database backup: $backup_file" | tee -a "$LOG"
+        
+        # Add scan_time column
+        sqlite3 "$DB_FILE" << EOF
+        BEGIN TRANSACTION;
+        ALTER TABLE file_index ADD COLUMN scan_time INTEGER;
+        CREATE INDEX IF NOT EXISTS idx_scan_time ON file_index(scan_time);
+        COMMIT;
+EOF
+        
+        if [ $? -eq 0 ]; then
+            echo "[$(date)] ✅ Database schema updated successfully" | tee -a "$LOG"
+        else
+            echo "[$(date)] ❌ Failed to update schema. Restoring backup..." | tee -a "$LOG"
+            mv "$backup_file" "$DB_FILE"
+            exit 1
+        fi
+    fi
+}
+
+# Initialize SQLite database if it doesn't exist
+init_database() {
+    echo "[$(date)] 📊 Initializing SQLite database..." | tee -a "$LOG"
+    
+    # Create database directory if it doesn't exist
+    if [ ! -d "$DB_DIR" ]; then
+        echo "[$(date)] Creating database directory $DB_DIR..." | tee -a "$LOG"
+        mkdir -p "$DB_DIR" || {
+            echo "[$(date)] ❌ Failed to create database directory. Trying alternative location..." | tee -a "$LOG"
+            DB_DIR="/root/.pbs-backup"
+            DB_FILE="$DB_DIR/index.db"
+            mkdir -p "$DB_DIR" || {
+                echo "[$(date)] ❌ Failed to create alternative database directory. Exiting." | tee -a "$LOG"
+                exit 1
+            }
+        }
+    fi
+    
+    # Ensure proper permissions
+    chmod 700 "$DB_DIR"
+    
+    # Create database if it doesn't exist
+    if [ ! -f "$DB_FILE" ]; then
+        echo "[$(date)] Creating new database file..." | tee -a "$LOG"
+        sqlite3 "$DB_FILE" << EOF
+        CREATE TABLE IF NOT EXISTS file_index (
+            path TEXT PRIMARY KEY,
+            size INTEGER,
+            mtime INTEGER,
+            hash TEXT,
+            last_backup TEXT,
+            file_exists INTEGER DEFAULT 1,
+            scan_time INTEGER
+        );
+        CREATE INDEX IF NOT EXISTS idx_mtime ON file_index(mtime);
+        CREATE INDEX IF NOT EXISTS idx_exists ON file_index(file_exists);
+        CREATE INDEX IF NOT EXISTS idx_scan_time ON file_index(scan_time);
+EOF
+        chmod 600 "$DB_FILE"
+    else
+        # Check and update schema if needed
+        check_and_update_schema
+    fi
+    
+    # Verify database is accessible
+    if ! sqlite3 "$DB_FILE" "SELECT 1;" > /dev/null 2>&1; then
+        echo "[$(date)] ❌ Failed to access database. Please check permissions." | tee -a "$LOG"
+        exit 1
+    fi
+    
+    echo "[$(date)] ✅ Database initialized successfully at $DB_FILE" | tee -a "$LOG"
+}
+
+# Function to scan a single directory from a file list
+scan_directory() {
+    local file_list="$1"
+    local dir=$(dirname "$file_list") # Infer directory from the file list path
+    local current_scan_time=$(date +%s) # Use a single scan time for the directory
+    local temp_file_prefix="$TMP_BACKUP/scan_$(basename "$dir")"
+    local start_time=$(date +%s)
+    local count=0
+    local files_per_second=0
+    local batch_size=1000
+    local current_batch=0
+    local changed_files=0
+    local new_files=0
+    local unchanged_files=0
+    local total_files_in_dir=$(wc -l < "$file_list") # Accurate count from the find output
+    local last_status_update_time=$start_time
+    local batch_start_time=$start_time
+
+    CURRENT_SCAN_DIR="$dir"
+    echo "[$(date)] 🔍 Scanning directory: $dir ($total_files_in_dir files)" | tee -a "$LOG"
+    
+    # Create temporary directory for batch files
+    mkdir -p "$TMP_BACKUP/batches"
+    local current_batch_sql_file="$TMP_BACKUP/batches/batch_$current_batch.sql"
+    > "$current_batch_sql_file" # Create/clear the first batch file
+
+    # --- Step 1: Pre-load existing file metadata from DB ---
+    echo "[$(date)] 📚 Pre-loading existing file metadata from database for $dir..." | tee -a "$LOG"
+    local db_metadata_file="$TMP_BACKUP/db_metadata_$(basename "$dir").csv"
+    # Export relevant data from DB to a temporary file
+    sqlite3 -separator '|' "$DB_FILE" "SELECT path, size, mtime, hash FROM file_index WHERE path LIKE '$dir/%';" > "$db_metadata_file"
+
+    # Read DB metadata into an associative array (if bash version supports it)
+    declare -A db_files_metadata
+    if [ -f "$db_metadata_file" ]; then
+        while IFS='|' read -r path size mtime hash; do
+            db_files_metadata["$path"]="$size|$mtime|$hash"
+        done < "$db_metadata_file"
+        rm -f "$db_metadata_file"
+    fi
+    echo "[$(date)] ✅ Pre-loading complete. Loaded ${#db_files_metadata[@]} entries."
+    # ---
+
+    # Read files from the pre-generated list and process them
+    while read -r file; do
+        # Skip if file doesn't exist (shouldn't happen with find output, but safety)
+        [ -f "$file" ] || continue
+        
+        ((count++))
+        
+        # Get file metadata from filesystem
+        local size=$(stat -c %s "$file" 2>/dev/null)
+        local mtime=$(stat -c %Y "$file" 2>/dev/null)
+        local hash=$(md5sum "$file" 2>/dev/null | cut -d' ' -f1)
+        
+        # Escape single quotes in file path for SQL
+        local escaped_file=$(echo "$file" | sed "s/'/''/g")
+        
+        local needs_batch_update=0
+
+        # --- Step 2: Check against pre-loaded metadata instead of querying DB ---
+        local db_data=${db_files_metadata["$file"]}
+        if [ -n "$db_data" ]; then
+            IFS='|' read -r db_size db_mtime db_hash <<< "$db_data"
+            if [ "$size" = "$db_size" ] && [ "$mtime" = "$db_mtime" ] && [ "$hash" = "$db_hash" ]; then
+                # File unchanged, count and skip adding to batch
+                ((unchanged_files++))
+                # No DB write needed here, file_exists will be set to 1 by INSERT OR REPLACE if it's in the batch
+                # But since unchanged files are NOT added to the batch, their file_exists=0 status
+                # from the initial UPDATE needs to be flipped. This is a key difference.
+                # Let's add them to a separate temporary file for a batch UPDATE at the end of the directory scan.
+                echo "$escaped_file" >> "$TMP_BACKUP/batches/unchanged_batch_$current_batch.sql"
+
+                needs_batch_update=0
+            else
+                # File changed
+                ((changed_files++))
+                needs_batch_update=1
+            fi
+        else
+            # New file
+            ((new_files++))
+            needs_batch_update=1
+        fi
+        # ---
+        
+        # Add to current batch only if new or changed
+        if [ $needs_batch_update -eq 1 ]; then
+            echo "INSERT OR REPLACE INTO file_index (path, size, mtime, hash, file_exists, scan_time) VALUES ('$escaped_file', $size, $mtime, '$hash', 1, $current_scan_time);" >> "$current_batch_sql_file"
+        fi
+
+        # Update status line periodically (e.g., every 100 files or every 2 seconds)
+        local current_time=$(date +%s)
+        local elapsed_status_time=$((current_time - last_status_update_time))
+
+        # Update terminal every 100 files or 2 seconds
+        if ((count % 100 == 0 || elapsed_status_time >= 2)); then
+             local processed_rate=$((count / $((current_time - start_time + 1)) )) # Files per second overall
+             local progress=$((count * 100 / total_files_in_dir))
+             if [ $progress -gt 100 ]; then progress=100; fi
+            
+             local bar_length=50
+             local filled=$((progress * bar_length / 100))
+             local empty=$((bar_length - filled))
+             local bar="["
+             for ((i=0; i<filled; i++)); do bar+="="; done
+             for ((i=0; i<empty; i++)); do bar+=" "; done
+             bar+="]"
+            
+             # Status line using in-memory counts, not querying DB frequently
+             echo -ne "\r[$(date)] 📊 $bar $progress% | Processed: $count (N:$new_files C:$changed_files U:$unchanged_files) | Rate: ${processed_rate}/s | Batch: $current_batch"
+             last_status_update_time=$current_time
+        fi
+
+        # Process batch if it reaches batch_size and contains new/changed files
+        local current_batch_lines=$(wc -l < "$current_batch_sql_file" || echo 0)
+        if (( current_batch_lines >= batch_size )); then
+            local batch_write_start_time=$(date +%s)
+
+            # Execute batch
+            # Clear current line before printing batch write message
+            echo -ne "\r\033[K"
+            echo "[$(date)] 💾 Writing batch $current_batch to database..." | tee -a "$LOG"
+            
+            # Add retry logic for database locked error
+            local db_write_success=0
+            local retry_count=0
+            while [ $retry_count -lt 15 ]; do # Increased retry attempts
+                if sqlite3 "$DB_FILE" "BEGIN TRANSACTION;\n$(cat "$current_batch_sql_file")\nCOMMIT;" 2>/dev/null; then
+                    db_write_success=1
+                    break
+                else
+                    retry_count=$((retry_count + 1))
+                    echo "[$(date)] ⚠️ Database locked, retry $retry_count..." | tee -a "$LOG"
+                    sleep 0.3 # Shorter sleep for quicker retries
+                fi
+            done
+
+            if [ $db_write_success -eq 0 ]; then
+                echo "[$(date)] ❌ Failed to write batch $current_batch after multiple retries. Exiting." | tee -a "$LOG"
+                exit 1
+            fi
+
+            echo "[$(date)] ✅ Batch $current_batch written." | tee -a "$LOG"
+            
+            # Calculate batch write rate
+            local batch_write_end_time=$(date +%s)
+            local batch_write_elapsed=$((batch_write_end_time - batch_write_start_time + 1))
+            local batch_file_count=$((current_batch_lines))
+            local batch_write_rate=$((batch_file_count / batch_write_elapsed))
+            echo "[$(date)] ⚡ Batch Write Rate: ${batch_write_rate}/s" | tee -a "$LOG"
+
+            # Update overall status line after batch commit to reflect new DB state
+            local current_time=$(date +%s)
+            local processed_rate=$((count / $((current_time - start_time + 1)) ))
+            local progress=$((count * 100 / total_files_in_dir))
+            if [ $progress -gt 100 ]; then progress=100; fi
+            
+            local bar_length=50
+            local filled=$((progress * bar_length / 100))
+            local empty=$((bar_length - filled))
+            local bar="["
+            for ((i=0; i<filled; i++)); do bar+="="; done
+            for ((i=0; i<empty; i++)); do bar+=" "; done
+            bar+="]"
+
+            # Get current DB status for combined output (only read after a batch commit)
+            local db_size=$(stat -c %s "$DB_FILE" 2>/dev/null)
+            local db_size_mb=$((db_size / 1024 / 1024))
+            local db_files=$(sqlite3 "$DB_FILE" "SELECT COUNT(*) FROM file_index WHERE file_exists = 1;" 2>/dev/null)
+
+            echo -ne "\r[$(date)] 📊 $bar $progress% | Processed: $count (N:$new_files C:$changed_files U:$unchanged_files) | Rate: ${processed_rate}/s | DB: ${db_size_mb}MB, Indexed: $db_files"
+            last_status_update_time=$current_time
+
+            # Move to next batch file
+            rm -f "$current_batch_sql_file"
+            ((current_batch++))
+            current_batch_sql_file="$TMP_BACKUP/batches/batch_$current_batch.sql"
+            > "$current_batch_sql_file" # Create/clear the next batch file
+
+        fi
+    done < "$file_list"
+
+    # Process any remaining files in the last batch
+    local current_batch_lines=$(wc -l < "$current_batch_sql_file" || echo 0)
+    if (( current_batch_lines > 0 )); then # Check if the last batch file has content
+        local batch_write_start_time=$(date +%s)
+        # Clear current line before printing final batch write message
+        echo -ne "\r\033[K"
+        echo "[$(date)] 💾 Writing final batch to database..." | tee -a "$LOG"
+        
+        # Add retry logic for database locked error
+        local db_write_success=0
+        local retry_count=0
+        while [ $retry_count -lt 15 ]; do # Increased retry attempts
+            if sqlite3 "$DB_FILE" "BEGIN TRANSACTION;\n$(cat "$current_batch_sql_file")\nCOMMIT;" 2>/dev/null; then
+                db_write_success=1
+                break
+            else
+                retry_count=$((retry_count + 1))
+                echo "[$(date)] ⚠️ Database locked, retry $retry_count..." | tee -a "$LOG"
+                sleep 0.5 # Shorter sleep for quicker retries
+            fi
+        done
+
+        if [ $db_write_success -eq 0 ]; then
+            echo "[$(date)] ❌ Failed to write final batch after multiple retries. Exiting." | tee -a "$LOG"
+            exit 1
+        fi
+
+        echo "[$(date)] ✅ Final batch written." | tee -a "$LOG"
+        
+        # Calculate batch write rate
+        local batch_write_end_time=$(date +%s)
+        local batch_write_elapsed=$((batch_write_end_time - batch_write_start_time + 1))
+        local batch_file_count=$((current_batch_lines))
+        local batch_write_rate=$((batch_file_count / batch_write_elapsed))
+        echo "[$(date)] ⚡ Final Batch Write Rate: ${batch_write_rate}/s" | tee -a "$LOG"
+
+        # Cleanup batch file
+        rm -f "$current_batch_sql_file"
+    else
+        # If the last batch file is empty, just remove it
+        rm -f "$current_batch_sql_file"
+    fi
+
+    # --- Step 3: Batch update scan_time for unchanged files ---
+    local unchanged_batch_file="$TMP_BACKUP/batches/unchanged_batch_$current_batch.sql"
+    if [ -f "$unchanged_batch_file" ] && [ $(wc -l < "$unchanged_batch_file" || echo 0) -gt 0 ]; then
+        echo "[$(date)] 🔄 Updating scan time for unchanged files in database..." | tee -a "$LOG"
+        local update_success=0
+        local retry_count=0
+        while [ $retry_count -lt 15 ]; do # Increased retry attempts
+            if sqlite3 "$DB_FILE" "BEGIN TRANSACTION;\nUPDATE file_index SET scan_time = $current_scan_time WHERE path IN ('$(cat "$unchanged_batch_file" | paste -sd ',' -)');\nCOMMIT;" 2>/dev/null; then
+                 update_success=1
+                 break
+            else
+                 retry_count=$((retry_count + 1))
+                 echo "[$(date)] ⚠️ Database locked during unchanged update, retry $retry_count..." | tee -a "$LOG"
+                 sleep 0.5
+            fi
+        done
+        if [ $update_success -eq 0 ]; then
+             echo "[$(date)] ❌ Failed to update scan time for unchanged files. Exiting." | tee -a "$LOG"
+             exit 1
+        fi
+        echo "[$(date)] ✅ Scan time updated for $unchanged_files unchanged files."
+        rm -f "$unchanged_batch_file"
+    elif [ -f "$unchanged_batch_file" ]; then
+         rm -f "$unchanged_batch_file"
+    fi
+    # ---
+
+    CURRENT_SCAN_DIR=""
+    
+    # Final verification and statistics
+    # Clear the last progress line before printing final stats
+    echo -ne "\r\033[K"
+    local total_in_db=$(sqlite3 "$DB_FILE" "SELECT COUNT(*) FROM file_index;")
+    local db_size=$(stat -c %s "$DB_FILE" 2>/dev/null)
+    local db_size_mb=$((db_size / 1024 / 1024))
+    echo "[$(date)] 📊 Directory scan completed: $dir" | tee -a "$LOG"
+    echo "[$(date)] - Files processed: $count" | tee -a "$LOG"
+    echo "[$(date)] - New files: $new_files" | tee -a "$LOG"
+    echo "[$(date)] - Changed files: $changed_files" | tee -a "$LOG"
+    echo "[$(date)] - Unchanged files: $unchanged_files" | tee -a "$LOG"
+    echo "[$(date)] - Total files in database: $total_in_db" | tee -a "$LOG"
+    echo "[$(date)] - Database size: ${db_size_mb}MB" | tee -a "$LOG"
+    
+    # Cleanup batch directory (done in update_file_list after all directories)
+    # rm -rf "$TMP_BACKUP/batches"
+}
+
+# Function to update file list in database (Incremental Scan)
+update_file_list() {
+    echo "[$(date)] 🔄 Starting incremental file system scan..." | tee -a "$LOG"
+    
+    # Mark all existing files as not found - will be updated to 1 during scan if found
+    echo "[$(date)] 🏷️  Marking existing files as potentially removed..." | tee -a "$LOG"
+    sqlite3 "$DB_FILE" "BEGIN TRANSACTION;"
+    sqlite3 "$DB_FILE" "UPDATE file_index SET file_exists = 0;"
+    sqlite3 "$DB_FILE" "COMMIT;"
+    
+    # Create temporary directory for the find output and batches
+    mkdir -p "$TMP_BACKUP"
+    
+    # Scan each directory
+    for dir in $SRC; do
+        if [ -d "$dir" ]; then
+            # Use find to create a temporary list of files first
+            local find_output_file="$TMP_BACKUP/scan_$(basename "$dir").find"
+            echo "[$(date)] 📋 Finding files in $dir..." | tee -a "$LOG"
+            # Add progress for the find command if 'pv' is available
+            if command -v pv >/dev/null 2>&1; then
+                find "$dir" -type f 2>/dev/null | pv -l -c -N "Finding files in $dir" > "$find_output_file"
+            else
+                find "$dir" -type f 2>/dev/null > "$find_output_file"
+            fi
+            
+            if [ -s "$find_output_file" ]; then # Check if the find output file is not empty
+                 scan_directory "$find_output_file"
+            else
+                 echo "[$(date)] ⚠️ No files found in $dir" | tee -a "$LOG"
+            fi
+
+            rm -f "$find_output_file"
+        else
+            echo "[$(date)] ⚠️ Directory not found: $dir" | tee -a "$LOG"
+        fi
+    done
+    
+    # Remove files that no longer exist
+    echo "[$(date)] 🧹 Cleaning up removed files..." | tee -a "$LOG"
+    sqlite3 "$DB_FILE" "BEGIN TRANSACTION;"
+    local removed_count=$(sqlite3 "$DB_FILE" "SELECT COUNT(*) FROM file_index WHERE file_exists = 0;")
+    sqlite3 "$DB_FILE" "DELETE FROM file_index WHERE file_exists = 0;"
+    sqlite3 "$DB_FILE" "COMMIT;"
+    echo "[$(date)] 🗑️  Removed $removed_count non-existent files" | tee -a "$LOG"
+    
+    # Get final statistics
+    local total_files=$(sqlite3 "$DB_FILE" "SELECT COUNT(*) FROM file_index;")
+    local db_size=$(stat -c %s "$DB_FILE" 2>/dev/null)
+    local db_size_mb=$((db_size / 1024 / 1024))
+    
+    echo "[$(date)] 📊 Scan completed:" | tee -a "$LOG"
+    echo "[$(date)] - Total files: $total_files" | tee -a "$LOG"
+    echo "[$(date)] - Database size: ${db_size_mb}MB" | tee -a "$LOG"
+    echo "[$(date)] - Directories scanned: $SRC" | tee -a "$LOG"
+    
+    # Verify database integrity
+    echo "[$(date)] 🔍 Verifying database integrity..." | tee -a "$LOG"
+    if sqlite3 "$DB_FILE" "PRAGMA integrity_check;" | grep -q "ok"; then
+        echo "[$(date)] ✅ Database integrity check passed" | tee -a "$LOG"
+    else
+        echo "[$(date)] ❌ Database integrity check failed!" | tee -a "$LOG"
+    fi
+    
+    # Cleanup temporary batch directory after all directories are scanned
+    rm -rf "$TMP_BACKUP/batches"
+    
+    # Cleanup main temporary directory (if empty)
+    rmdir "$TMP_BACKUP" 2>/dev/null
+}
+
+# Function to get files that need backup
+get_files_to_backup() {
+    sqlite3 "$DB_FILE" "SELECT path FROM file_index WHERE needs_backup = 1;"
+}
+
+# Function to check if file needs backup
+needs_backup() {
+    local file="$1"
+    local current_mtime=$(stat -c %Y "$file")
+    local current_size=$(stat -c %s "$file")
+    local current_hash=$(md5sum "$file" | cut -d' ' -f1)
+    
+    local db_data=$(sqlite3 "$DB_FILE" "SELECT size, mtime, hash FROM file_index WHERE path='$file';")
+    if [ -z "$db_data" ]; then
+        return 0  # File not in database, needs backup
+    fi
+    
+    IFS='|' read -r db_size db_mtime db_hash <<< "$db_data"
+    if [ "$current_mtime" -ne "$db_mtime" ] || [ "$current_size" -ne "$db_size" ] || [ "$current_hash" != "$db_hash" ]; then
+        return 0  # File changed, needs backup
+    fi
+    
+    return 1  # File unchanged, no backup needed
+}
+
+# Initialize database at script start
+init_database
+
+# Update file list in database
+update_file_list
+
+# Create a temporary file list with files that need backup
+echo "[$(date)] 📋 Creating backup list..." | tee -a "$LOG"
+get_files_to_backup > "$TMP_BACKUP/filelist.txt"
+
+# Initialize variables for chunk creation
+chunk_num=1
+current_chunk_size=0
+current_chunk_files=()
+total_files=$(wc -l < "$TMP_BACKUP/filelist.txt")
+processed_files=0
+skipped_files=0
+
+echo "[$(date)] 🔍 Starting backup process (files to backup: $total_files)..." | tee -a "$LOG"
 
 # === Cleanup function ===
 cleanup_old_backups() {
@@ -141,25 +718,31 @@ cleanup_processes() {
         
         echo "[$(date)] Attempt $attempt: Found processes: $pids" | tee -a "$LOG"
         
-        # First try SIGTERM
+        # Kill each process individually and verify it's gone
-        kill -15 $pids 2>/dev/null
+        for pid in $pids; do
-        sleep 5
+            if [ -e "/proc/$pid" ]; then
+                echo "[$(date)] Terminating process $pid..." | tee -a "$LOG"
+                kill -15 "$pid" 2>/dev/null
+                sleep 1
                 
-        # Check if processes are still running
+                # Check if process still exists
-        pids=$(lsof -t "$mount_point" 2>/dev/null | grep -v "$$")
+                if [ -e "/proc/$pid" ]; then
-        if [ -n "$pids" ]; then
+                    echo "[$(date)] Process $pid still running, sending SIGKILL..." | tee -a "$LOG"
-            echo "[$(date)] Processes still running, sending SIGKILL..." | tee -a "$LOG"
+                    kill -9 "$pid" 2>/dev/null
-            kill -9 $pids 2>/dev/null
+                    sleep 1
-            sleep 5
                 fi
+            fi
+        done
         
-        # Final check
+        # Final check for any remaining processes
-        if [ -z "$(lsof -t "$mount_point" 2>/dev/null | grep -v "$$")" ]; then
+        pids=$(lsof -t "$mount_point" 2>/dev/null | grep -v "$$")
+        if [ -z "$pids" ]; then
             echo "[$(date)] Successfully cleaned up all processes" | tee -a "$LOG"
             return 0
         fi
         
         ((attempt++))
+        sleep 2
     done
     
     echo "[$(date)] ⚠️ Warning: Could not clean up all processes after $max_attempts attempts" | tee -a "$LOG"
@@ -173,32 +756,25 @@ mount_share() {
     if mountpoint -q "$MOUNT_POINT"; then
         echo "[$(date)] Share already mounted, attempting to unmount..." | tee -a "$LOG"
         
-        # Clean up any processes first
+        # First try lazy unmount
+        echo "[$(date)] Attempting lazy unmount..." | tee -a "$LOG"
+        umount -l "$MOUNT_POINT" 2>/dev/null
+        sleep 2
+        
+        # If still mounted, try to clean up processes and unmount
+        if mountpoint -q "$MOUNT_POINT"; then
+            echo "[$(date)] Share still mounted, cleaning up processes..." | tee -a "$LOG"
             cleanup_processes "$MOUNT_POINT"
             
-        # Try to unmount gracefully first
+            # Try normal unmount
             umount "$MOUNT_POINT" 2>/dev/null
             sleep 2
             
             # If still mounted, try force unmount
             if mountpoint -q "$MOUNT_POINT"; then
-            echo "[$(date)] Force unmounting..." | tee -a "$LOG"
+                echo "[$(date)] Attempting force unmount..." | tee -a "$LOG"
                 umount -f "$MOUNT_POINT" 2>/dev/null
                 sleep 2
-            
-            # If still mounted, try lazy unmount
-            if mountpoint -q "$MOUNT_POINT"; then
-                echo "[$(date)] Lazy unmounting..." | tee -a "$LOG"
-                umount -l "$MOUNT_POINT" 2>/dev/null
-                sleep 2
-                
-                # If still mounted, try one more time with process cleanup
-                if mountpoint -q "$MOUNT_POINT"; then
-                    cleanup_processes "$MOUNT_POINT"
-                    sleep 2
-                    umount -f "$MOUNT_POINT" 2>/dev/null
-                    sleep 2
-                fi
             fi
         fi
         
@@ -365,40 +941,82 @@ mkdir -p "$BACKUP_DIR"
 # Step 5: Create backup in chunks with space management
 echo "[$(date)] 🗜️ Starting backup with space management..." | tee -a "$LOG"
 
-# Build find command exclusions
-build_find_exclusions() {
-    local exclusions=""
-    for pattern in "${EXCLUDE_PATTERNS[@]}"; do
-        exclusions+=" -not -path '*/$pattern/*' -not -name '$pattern'"
-    done
-    echo "$exclusions"
-}
-
 # Create a temporary file list with exclusions
 echo "[$(date)] 📋 Creating file list (excluding unnecessary files)..." | tee -a "$LOG"
-eval "find $SRC -type f $(build_find_exclusions) > \"$TMP_BACKUP/filelist.txt\""
+
+# Function to check if pv is installed
+check_pv() {
+    command -v pv >/dev/null 2>&1
+}
+
+# Function to show progress bar
+show_progress() {
+    if check_pv; then
+        pv -l -s "$1" -N "Scanning files"
+    else
+        local count=0
+        local total="$1"
+        while read -r line; do
+            ((count++))
+            echo -ne "\r[$(date)] 📋 Scanning files: $count/$total ($((count * 100 / total))%)" | tee -a "$LOG"
+            echo "$line"
+        done
+        echo
+    fi
+}
+
+# First, count total files to scan
+echo "[$(date)] 🔍 Counting files to scan..." | tee -a "$LOG"
+total_files=$(eval "find $SRC -type f $(build_find_exclusions) | wc -l")
+echo "[$(date)] 📊 Found $total_files files to process" | tee -a "$LOG"
+
+# Create file list with progress
+echo "[$(date)] 📋 Creating file list with exclusions..." | tee -a "$LOG"
+eval "find $SRC -type f $(build_find_exclusions)" | show_progress "$total_files" > "$TMP_BACKUP/filelist.txt"
 
 # Initialize variables for chunk creation
 chunk_num=1
 current_chunk_size=0
 current_chunk_files=()
+processed_files=0
+skipped_files=0
+
+echo "[$(date)] 🔍 Starting file analysis (total files: $total_files)..." | tee -a "$LOG"
 
 # Process files and create chunks
 while IFS= read -r file; do
     # Skip if file doesn't exist
     [ -f "$file" ] || continue
     
-    # Get file size
+    ((processed_files++))
+    echo -ne "[$(date)] 📊 Progress: $processed_files/$total_files files processed (${skipped_files} skipped)\r" | tee -a "$LOG"
+    
+    # Check if file needs backup using database
+    if ! needs_backup "$file"; then
+        ((skipped_files++))
+        continue
+    fi
+    
+    # Get file size and metadata
     file_size=$(stat -c %s "$file")
+    file_mtime=$(stat -c %Y "$file")
+    file_hash=$(md5sum "$file" | cut -d' ' -f1)
+    
+    # Update database with new file metadata
+    sqlite3 "$DB_FILE" << EOF
+    INSERT OR REPLACE INTO file_index (path, size, mtime, hash, file_exists)
+    VALUES ('$file', $file_size, $file_mtime, '$file_hash', 1);
+EOF
     
     # If adding this file would exceed chunk size, create the chunk
     if [ $((current_chunk_size + file_size)) -gt $(numfmt --from=iec $CHUNK_SIZE) ]; then
         if [ ${#current_chunk_files[@]} -gt 0 ]; then
-            echo "[$(date)] 📦 Creating chunk $chunk_num with ${#current_chunk_files[@]} files..." | tee -a "$LOG"
+            echo -e "\n[$(date)] 📦 Creating chunk $chunk_num with ${#current_chunk_files[@]} files..." | tee -a "$LOG"
             
-            # Create the chunk and wait for it to complete
+            # Create the chunk with verbose output
             chunk_file="$TMP_BACKUP/chunk_$(printf "%03d" $chunk_num).7z"
-            7z a -y -spf -t7z -m0=lzma2 -mx=5 "$chunk_file" "${current_chunk_files[@]}" | tee -a "$LOG"
+            echo "[$(date)] 🔄 Compressing files into chunk $chunk_num..." | tee -a "$LOG"
+            7z a -y -spf -t7z -m0=lzma2 -mx=5 -v "$chunk_file" "${current_chunk_files[@]}" | tee -a "$LOG"
             
             # Wait for 7z to complete and verify the chunk exists
             if [ -f "$chunk_file" ]; then
@@ -435,11 +1053,17 @@ while IFS= read -r file; do
     current_chunk_size=$((current_chunk_size + file_size))
 done < "$TMP_BACKUP/filelist.txt"
 
+echo -e "\n[$(date)] 📊 Backup summary:" | tee -a "$LOG"
+echo "[$(date)] - Total files processed: $total_files" | tee -a "$LOG"
+echo "[$(date)] - Files skipped (unchanged): $skipped_files" | tee -a "$LOG"
+echo "[$(date)] - Files backed up: $((total_files - skipped_files))" | tee -a "$LOG"
+
 # Create final chunk if there are remaining files
 if [ ${#current_chunk_files[@]} -gt 0 ]; then
     echo "[$(date)] 📦 Creating final chunk $chunk_num with ${#current_chunk_files[@]} files..." | tee -a "$LOG"
     chunk_file="$TMP_BACKUP/chunk_$(printf "%03d" $chunk_num).7z"
-    7z a -y -spf -t7z -m0=lzma2 -mx=5 "$chunk_file" "${current_chunk_files[@]}" | tee -a "$LOG"
+    echo "[$(date)] 🔄 Compressing files into final chunk..." | tee -a "$LOG"
+    7z a -y -spf -t7z -m0=lzma2 -mx=5 -v "$chunk_file" "${current_chunk_files[@]}" | tee -a "$LOG"
     
     # Wait for 7z to complete and verify the chunk exists
     if [ -f "$chunk_file" ]; then