I ran across an interesting error on a client's server this past week. Their nightly backup had begun crashing without any reported cause. The results of the last back-up simply said crashed.
The logs did not show any clear reason why this would be happening. Other than they had several instances of “Bad media” reported in some of their last actual back-up attempts.
Side note: Pay more attention to your back-ups people!! if you start seeing “Crashed” errors. Don't wait a month before asking someone for help!
We put new tapes in the drive and attempted the back-up job again. It would run the first section of the job until 5-10% then it would just stop. No errors.. Just stop..