How to do a mass delete of backups

I am on a set of nanos....

One of my antlets (well actually several) have tons of failed backups listed because of daily backups going to a mounted NAS volume that ran out of space.   So one of the antlets lists 227 backups, most of them "self-managed" 0B in size and status of "backing up".     How can I mass delete a whole bunch of them, it is really tedious to individual click delete, and then confirm the delete, on each one of them.

Also i think for many of my virtual machines that arent doing much, a weekly, or a monthly backup would be enough.

Also when i say backup now, self managed, it should remember the mount path I previously set.

Bumping this as I agree and would like a method to do mass deletions and custom backup schedules. Is there a way to set these? Maybe through API or cli? Thanks.