On my 2003 SBS server, I unselected some exchange accounts, submitted the change, and have had this bizarre problem ever since.
The server ejects the tape before the backup starts, it says "loading media" but then the tape ejects as soon as it rewinds.
If I reboot the server, I get one good backup before it happens again. Even if I start and stop all BE services, it doesn't seem to make a difference.
The job is not set to eject media after it completes, and there should be enough space on the tape for the data.
I'm getting pretty desperate here - I can't reboot the server every day, and this particular server stores project data (plus is our exchange server). Any help at all would be greatly appreciated, I've been staring at this for so long its very possible I've missed the blatantly obvious.