Where are the tapes?
A few years ago now, in a job I'm trying to forget,a wondrous bit of kit was installed in a server room. Although it was in the IT server room it was the responsibility of another department.
Part of the wondrous machine was a SAN. There was also a pair of DAT drives for daily backups. The tapes were stored in the same server room, on top of the DAT drives and were on a seven day cycle. Over the first twelve months the tapes weren't changed, ever!
IT techs were deemed to stupid to do the job and the wondrous machine owners couldn't be arsed.
And this was discovered when a restore was requested. 365 data backups tends to wear out the tapes.......