Try to use "New Backup system (beta)" to make "Incremental" backups.
Please pay attention it is "beta", however it works fine for me.
When I use incremental backup, I receive a message like this, but I don't see any backup at all, the folder is empty.
2025-04-18 08:29:56 *********** INCREMENTAL ****************
2025-04-18 08:29:56 *********** LOCAL ****************
2025-04-18 08:29:56 {"1":{"DAY":"\/manual\/","RET":"2"}}
2025-04-18 08:29:56 END
2025-04-18 08:29:56 Backup Finished