Improve 'save-passwddb' script

.bin/save-passwddb

@@ -2,24 +2,74 @@
 
 # Save (encrypted) password database to cloud storage
 #
-# Can be run manually or daily by enabling the corresponding systemd user
-# service and timer, i.e.
-#
-# `systemctl --user enable save-passwddb.service`
-# `systemctl --user enable save-passwddb.timer`
+# Usage:
+#   save-passwddb         - Save databases to cloud
+#   save-passwddb init    - Restore databases from cloud (with single backup archive)
 
-RCLONE_REMOTE="proton-drive"
+RCLONE_REMOTE="proton"
+SOURCE_DIR="$HOME/doc"
+TARGET_DIR="$RCLONE_REMOTE:doc"
+BACKUP_DIR="$HOME/doc/bak"
 
-# Reference: <https://unix.stackexchange.com/questions/100871/in-a-bash-if-condition-how-to-check-whether-any-files-matching-a-simple-wildcard>
-if [ 0 -lt "$(ls $HOME/doc/*.kdbx 2>/dev/null | wc -w)" ]; then
-  echo "Saving KeePassXC databases and database keys"
-  rclone copyto                         \
-    "$HOME/doc/" "$RCLONE_REMOTE:doc"/  \
-    --progress                          \
-    --include "/*.{kdbx,kdbx.key}"
+function save_databases() {
+  if [ 0 -lt "$(ls $SOURCE_DIR/*.kdbx 2>/dev/null | wc -w)" ]; then
+    echo "[save] Saving KeePassXC databases and database keys"
+    rclone copy "$SOURCE_DIR" "$TARGET_DIR" \
+      --include "/*.{kdbx,kdbx.key}" \
+      --progress
+    echo "[save] Done"
   else
-  echo "No password database found, use the following commands to restore"
+    echo "[save] No password database found, restore with:"
     echo ""
-  echo "rclone copy $RCLONE_REMOTE:doc \"$HOME/doc\" --include \"*.{kdbx,kdbx.key}\""
+    echo "  $0 init"
     exit 1
   fi
+}
+
+function backup_existing() {
+  mkdir -p "$BACKUP_DIR"
+  local timestamp=$(date +%Y%m%d-%H%M%S)
+  local backup_file="$BACKUP_DIR/passwddb_backup_${timestamp}.tar.gz"
+
+  echo "[backup] Creating backup archive: ${backup_file}"
+  tar -czf "$backup_file" -C "$SOURCE_DIR" $(find "$SOURCE_DIR" -maxdepth 1 -type f \( -name "*.kdbx" -o -name "*.kdbx.key" \) -printf "%f ")
+  echo "[backup] Backup complete"
+}
+
+function restore_databases() {
+  echo "[init] Checking for existing files..."
+
+  local existing_files=$(find "$SOURCE_DIR" -maxdepth 1 -type f \( -name "*.kdbx" -o -name "*.kdbx.key" \) -print)
+
+  if [ -n "$existing_files" ]; then
+    echo "[init] Found existing database files:"
+    echo "$existing_files" | while read -r file; do
+      echo "  - $file"
+    done
+    read -p "[init] Create backup archive of existing files? [y/N] " -n 1 -r
+    echo
+    if [[ $REPLY =~ ^[Yy]$ ]]; then
+      backup_existing
+    fi
+  fi
+
+  echo "[init] Restoring KeePassXC databases and database keys"
+  mkdir -p "$SOURCE_DIR"
+  rclone copy "$TARGET_DIR" "$SOURCE_DIR" \
+    --include "*.{kdbx,kdbx.key}" \
+    --progress
+  echo "[init] Done"
+}
+
+case "$1" in
+  ""|save)
+    save_databases
+    ;;
+  init)
+    restore_databases
+    ;;
+  *)
+    echo "Usage: $0 [init|save]"
+    exit 1
+    ;;
+esac