I have two mail in a box systems. Both functionally work just as intended. Only one of them has an issue with backups. They just stopped happening. I have set it up to store backups locally. I then rsync those elsewhere daily. This is what the backups page looks like as of today, 7/19/2022:
Version: v57a (I upgraded from 56 while troubleshooting)
Not customizations, just storing locally.
Status checks is all green.
Not receiving any messages that it is not working.
Is there a log file that should show backup task runs?