On Thu, 23 Sep 2021 17:16:21 +0000
g4sra via Dng <dng@???> wrote:

> A rookie sysadmin mistake is to take backups but never ever do a test
> restore to ensure they are OK.

Can confirm.

I had a backup persistency file which felt "old" when I tried using it.

Backups seemed to be going impressively fast; suspiciously fast.

I finally figured out that it wasn't because it was a huge file that
was being skipped, but that it wasn't ever being backed up /
overwritten in the first place.

Of course its size wouldn't change, but apparently a persistency file
doesn't get its modification time changed when it's written-within. I
never would have guessed..