Unfortunately you can’t do that with a third party app, unless:
- eM Client is closed at the time the backup is made. If eM Client is running, you may end up with empty backup files.
- The backup takes a complete separate snapshot of the whole database every time. Incremental and differential backups won’t work.
The backup is a snapshot of the complete database. Restoring it will revert local data and settings to the way it was when the backup was made. Synced data will revert to what is currently on the server.
If you want eM Client to do the backups every few hours, though we don’t recommend that, the process is available here with screenshots. What is the best way to back-up eM Client? - #16 by Gary