Auto-prune request

### Description

Feature request

It would be great if you had an auto prune setting so that my backups wouldn't just be added to my s3 indefinitely. If I was running my cron twice a day I could set a number it would prune older backups so I could have one months backups at all time.

Also if I delete a backup from control panel it does not delete from my bucket. is this intentional?