Can Time Machine use HFS+ backup disk under Big Sur or Monterey?
Today I thought I had shown Time Machine backs up successfully to an existing HFS+ backup drive under Big Sur v. 11.6.2. I ignored the error messages I had been getting saying backing up failed and verified I could roll back to recent snapshots.
However I now realise that, although the timeline on the right of the screen after entering Time Machine seems to show I can roll back a couple of years, when I try I see no snapshots beyond when I first tried to back up under Big Sur (until recently I had been using Mojave). Does that mean I have really destroyed the old backups and there is no point in not reformatting my backup disks to APFS?
MacBook Pro 15″, OS X 10.11