diff --git a/immich/backup-immich.sh b/immich/backup-immich.sh
index 6e5efe4..083228f 100755
--- a/immich/backup-immich.sh
+++ b/immich/backup-immich.sh
@@ -53,13 +53,13 @@ cleanup() {
 trap cleanup EXIT SIGINT SIGTERM
 
 # Load environment variables from the .env file
-ENV_FILE="$(dirname "$0")/../.env"
+ENV_FILE="${SCRIPT_DIR}/../.env"
 if [ -f "$ENV_FILE" ]; then
     echo "Loading environment variables from $ENV_FILE"
     # shellcheck source=/dev/null
     source "$ENV_FILE"
 else
-    echo "Error: .env file not found in $(dirname "$0")/.."
+    echo "Error: .env file not found in ${SCRIPT_DIR}/.."
     exit 1
 fi
 
@@ -109,6 +109,7 @@ EXAMPLES:
     $(basename "$0") --help       # Show this help
     $(basename "$0") --dry-run    # Preview backup without executing
     $(basename "$0") --no-upload  # Backup locally only (skip B2)
+    $(basename "$0") --upload-only # Only upload the latest existing backup to B2
 
 RESTORE INSTRUCTIONS:
     https://immich.app/docs/administration/backup-and-restore/
@@ -119,6 +120,7 @@ EOF
 # Parse command line arguments
 DRY_RUN=false
 NO_UPLOAD=false
+UPLOAD_ONLY=false
 VERBOSE=false
 
 while [[ $# -gt 0 ]]; do
@@ -135,6 +137,10 @@ while [[ $# -gt 0 ]]; do
             NO_UPLOAD=true
             shift
             ;;
+        --upload-only)
+            UPLOAD_ONLY=true
+            shift
+            ;;
         --verbose)
             VERBOSE=true
             shift
@@ -148,12 +154,12 @@ while [[ $# -gt 0 ]]; do
 done
 
 # B2 CLI tool path
-if [ -f "$(dirname "$0")/b2-linux" ]; then
-    B2_CLI="$(dirname "$0")/b2-linux"
+if [ -f "${SCRIPT_DIR}/b2-linux" ]; then
+    B2_CLI="${SCRIPT_DIR}/b2-linux"
 elif command -v b2 &> /dev/null; then
     B2_CLI=$(command -v b2)
 else
-    B2_CLI="$(dirname "$0")/b2-linux"
+    B2_CLI="${SCRIPT_DIR}/b2-linux"
 fi
 
 # Notification function
@@ -204,17 +210,40 @@ upload_to_b2() {
     log_message "Uploading $filename to B2 bucket: $B2_BUCKET_NAME"
 
     # Authorize B2 account
-    if ! "$B2_CLI" authorize-account "$B2_APPLICATION_KEY_ID" "$B2_APPLICATION_KEY" 2>/dev/null; then
+    local auth_output
+    if ! auth_output=$("$B2_CLI" authorize-account "$B2_APPLICATION_KEY_ID" "$B2_APPLICATION_KEY" 2>&1); then
         log_message "Error: Failed to authorize B2 account"
+        log_message "B2 Output: $auth_output"
         return 1
     fi
 
     # Upload file to B2
-    if "$B2_CLI" upload-file "$B2_BUCKET_NAME" "$file_path" "immich-backups/$filename" 2>/dev/null; then
+    local temp_log
+    temp_log=$(mktemp)
+    
+    # Enable pipefail to catch b2 exit code through tee
+    set -o pipefail
+    
+    # Use --threads 4 to avoid "More than one concurrent upload using auth token" error
+    # which can happen with default thread count on large files
+    if "$B2_CLI" file upload --threads 4 "$B2_BUCKET_NAME" "$file_path" "immich-backups/$filename" 2>&1 | tee "$temp_log"; then
+        set +o pipefail
+        rm "$temp_log"
         log_message "✅ Successfully uploaded $filename to B2"
         return 0
     else
+        local exit_code=$?
+        set +o pipefail
         log_message "❌ Failed to upload $filename to B2"
+        
+        # Log the last few lines of output to capture the error message
+        # avoiding the progress bar spam
+        local error_msg
+        error_msg=$(tail -n 20 "$temp_log")
+        log_message "B2 Output (last 20 lines):"
+        log_message "$error_msg"
+        
+        rm "$temp_log"
         return 1
     fi
 }
@@ -223,7 +252,7 @@ upload_to_b2() {
 IMMICH_SERVER_RUNNING=true
 
 # Set up logging to central logs directory
-LOG_DIR="$(dirname "$0")/../logs"
+LOG_DIR="${SCRIPT_DIR}/../logs"
 mkdir -p "$LOG_DIR"
 LOG_FILE="${LOG_DIR}/immich-backup.log"
 
@@ -243,10 +272,35 @@ mkdir -p "$BACKUP_DIR"
 # Shared backup directory (can be overridden in .env)
 SHARED_BACKUP_DIR="${SHARED_BACKUP_DIR:-/mnt/share/media/backups/immich}"
 
-# Generate timestamp for the backup filename
+# Handle upload-only mode
+if [ "$UPLOAD_ONLY" = true ]; then
+    log_message "=== UPLOAD ONLY MODE ==="
+    log_message "Skipping backup creation, looking for latest backups in $SHARED_BACKUP_DIR"
+
+    # Find latest database backup
+    LATEST_DB=$(ls -t "$SHARED_BACKUP_DIR"/immich_db_backup_*.sql.gz 2>/dev/null | head -n1)
+    if [ -f "$LATEST_DB" ]; then
+        log_message "Found latest database backup: $LATEST_DB"
+        upload_to_b2 "$LATEST_DB"
+    else
+        log_message "Warning: No database backup found in $SHARED_BACKUP_DIR"
+    fi
+
+    # Find latest uploads backup
+    LATEST_UPLOADS=$(ls -t "$SHARED_BACKUP_DIR"/immich_uploads_*.tar.gz 2>/dev/null | head -n1)
+    if [ -f "$LATEST_UPLOADS" ]; then
+        log_message "Found latest uploads backup: $LATEST_UPLOADS"
+        upload_to_b2 "$LATEST_UPLOADS"
+    else
+        log_message "Warning: No uploads backup found in $SHARED_BACKUP_DIR"
+    fi
+    
+    log_message "Upload only mode completed."
+    exit 0
+fi
 
 # Create backup directory if it doesn't exist
-BACKUP_DIR="$(dirname "$0")/../immich_backups"
+BACKUP_DIR="${SCRIPT_DIR}/../immich_backups"
 mkdir -p "$BACKUP_DIR"
 
 # Generate timestamp for the backup filename
@@ -446,8 +500,9 @@ log_message "Creating compressed archive of upload directory..."
 log_message "This may take a while depending on the size of your media library..."
 
 # Use tar with progress indication and exclude any existing backup files in the upload location
-if ! tar --exclude="${UPLOAD_LOCATION}/backups/*.tar.gz" \
-     --exclude="${UPLOAD_LOCATION}/backups/*.sql.gz" \
+# Note: Exclude patterns must match the relative path structure used by -C
+if ! tar --exclude="$(basename "${UPLOAD_LOCATION}")/backups/*.tar.gz" \
+     --exclude="$(basename "${UPLOAD_LOCATION}")/backups/*.sql.gz" \
      -czf "${UPLOAD_BACKUP_PATH}" \
      -C "$(dirname "${UPLOAD_LOCATION}")" \
      "$(basename "${UPLOAD_LOCATION}")"; then