I 2nd Thilo’s comment: the rule I’ve always heard and have actually grokked is “always test *all* your backups” but even after having been burned by bad backups in the past I still don’t practice it religiously. I figure it’s a combination of the relief and exhaustion you feel when the restore is finally running again and the absolute last thing you want to do is test more backups and the hole-in-the-roof problem when you don’t think about testing the backups unless you’re having a backup problem.

Glad everything’s back up, though!

That seems to happen a lot.
We have lost two months worth of Subversion commits that way.

Since no one cares about backups until you need them, no one bothers to monitor the backup scripts (and no one practices the recovery procedures either), and according to Murphy, automated processes fail as soon as you stop watching them.