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If you have a compilationtree, try the following:
cd client-src
make getfsent
./getfsent /home

What is the fstype reported forr the filesystem?

Do the compilation found xfsdump?
$ grep...

zmanda binaries for ubuntu-8.04 doesn't include xfs. You needs to compile it yourself.

If your dump fit on one tape, disabling spliting can inprove speed.
The use of a holding disk improve speed...