Well...this is the format of the command I used to back up my filesystems...
dump -0uaLn -f - /usr | gzip -2 | dd of=/media/iomega/usr/dump-usr-5-5.gz
Didn't take as long as I expected (about 4 hours)...even though /usr was a 50GB filesystem and the pipe was USB 1.0.
--Damien
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