ISTR that tape drive speed divided into the capacity was pretty constant across multiple LTO generations. About three hours to fill a tape, I think. We used t

ISTR that tape drive speed divided into the capacity was pretty constant across multiple LTO generations. About three hours to fill a tape, I think. We used to run "Dell" storage and tape (rebranded ADIC changer and Quantum/IBM drives). A tape changer would autoload tapes under command of the backup software. It would run overnight, automatically changing the tapes two or three times, as required, without issues. Restore was another problem, mostly the fault of the software.