I’ve saw a multi-million dollar company go under, once, because they’d never bothered to swap the tape in their automated backup system. We’d built the system, for them, to run daily incrementals M-Th, and full backups on F. We’d even eject the tape, when we were done. All they had to do was to put in the next day’s tape (or the next of the set of four F tapes), when they came in in the morning.
When their disk packed up, it turned out that they’d been pushing the Tu tape back in, every day, and their most recent full backup was ten months old.
We made sure they got our bill, before they declared bankruptcy.
Never underestimate the bandwidth of an SUV full of hard drives going the speed limit.