FEATURE: Extend scope of "PRUNE_BACKUPS_*", to support x amount of backups, and maybe even "x amount of space used"

[exetico]

Hi,

I've tried to look through the docs and the code for a "max amount of backups", or "max amount of space" before backup-deletion.

Would you consider to expand the scope to include that?

(Today I filled up our server, by creating a backup every 30 minute :smile:. I guess it's overlapping a bit with restic, but I'd like to keep it simple)

Thank you for the solution, btw.

[itzg]

Yes, that sounds like a great idea. A PR would be welcome, but I'll also queue this up.