How to delete Backups?

When doing a backup every day, the size of all backups could grow significantly. Also, very old backups might be no longer compatible with the current webapp. Therefore, I want to delete old backups.

How can I achieve this? I didn’t find anything built-in in the docs.

Is this even possible with incremental backups?

Should I instead use a unique bucket/destination for each of my backups and do a full backup every time? Then deleting a backup just comes down to deleting that bucket.