I'll read through it and check details when I get a chance. I'm not really familiar with Debian, but I depend on Amanda all the time. Sometimes, I almost forget it is running until it sends me a reminder that I need to do something. I run a rotation of 30 AIT5 tapes (5 a week), and my tape library only holds 16. So, periodically I have to shuffle a few tapes in and out of the library.
There are also references here:
and a quick start guide on the Zmanda wicki.