I see a warning when creating a backup

If a warning is displayed when creating backup, the backup might be incomplete. But you can still save the backup file.

Action “HMShortcutAction” in scene “…” is not supported.

This warning is shown if an automation containing a shortcut cannot be stored in a backup. The reason for this is a technical limitation, which prohibits third-party apps the use of shortcuts in automations. Therefore automation shortcuts cannot be restored.