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I am thinking the DR tapes were only used for off site DR storage, I.E. portable non network attached storage.
Some expert perhaps told them that the DR files would be unrecoverable if the storage system had a accident, which is sort of true, and also why most people who do
this sort of stuff have local offline backups of the storage system itself.
Most companies either are moving away from tape or have already. We offsite our backups between our corporate office and hosting facility and its all on disk. We just replicate between backup cores and then between SANs. Of course the government is notoriously always 10 to 20 years behind the trends technology wise (and they usually are lacking in IT talent as their salaries just aren't that competitive). Disk space is so cheap anymore that it's cost effective to do so, and I trust Raid 6 much more than tapes stored in some dusty cave somewhere. Back when we used tapes, a good percentage of the time that i requested them back they were unreadable.