In the "other" screen's backup section, you can configure how many backups to keep. A full backup contains all save data for a game, while a differential backup contains just the data that has changed since the last full backup.
When Ludusavi makes a new backup for a game, it will also remove any excess backups for that specific game. When a full backup is deleted, its associated differential backups are deleted as well.
For example, if you configure a retention limit of 2 full and 2 differential, then Ludusavi will create 2 differential backups for each full backup, like so:
- Backup #1: full
- Backup #2: differential
- Backup #3: differential
- Backup #4: full
- Backup #5: differential
- Backup #6: differential
When backup #7 is created, because the full retention is set to 2, Ludusavi will delete backups 1 through 3.
If your full retention is only 1 and your differential retention is 1+, then Ludusavi will keep the full backup and just delete the oldest differential as needed.
On the restore screen, you can use the three-dot menu next to a game to lock any of its backups. Locked backups do not count toward the retention limits and are retained indefinitely.