...then there's backup stories...
....like the AS/400 upgrade where we were upgrading the memory and all the disk storage and the OS version...all in a weekend. Near the end of the process, we needed to get some stuff off the last tape backup.
So then we found out that NONE of the tape backups was readable!!! No one had ever tested a restore!!!
It all worked out all right in the end....but a lesson there....somewhere!