This one time, at band camp, Joe Rhett wrote:
>1. Why aren't we backing up chunks to different tapes yet?  Amanda is the
>only backup software which doesn't handle this.
>
>-and more importantly-
>
>2. Why is it trying to back up 53gb to a 33gb tape definition?
>
>#2 is clearly a bug.  #1 is a feature request long overdue, but #2 is
>clearly the bug.

There's a patch from John Stange that I don't believe has been committed to
CVS, but it takes care of splitting dumps and spanning tapes.  Grep for it
on the amanda-hackers list.  Doesn't fix #2, but should take care of #1 for
you.