Except that as soon as the tapes are written they are obselete and the data is stale, and so they realistically cannot be accepted as a valid copy of the data.
Don't know about that, but the necessary tape drive (IBM TS1170 according to Wikipedia) seems to be very hard to come by, as I couldn't even find a price via Google. It might be a better option to put the data on ~24 Seagate HDDs with a capacity of 26 TB each.
