For backing up my BackupPC pool I've found that using xfs on top of
lvm to be a great solution.

lvm allows you to make a snapshot of the pool. This is nice if you
only have a small window between when your servers stop backing up and
your users workstations start.

xfs has a great tool called xfs_copy. This tool will automatically
"freeze" your filesystem if you're on lvm. (hence it's good to do this
on a snapshot) and then copy the fs to another block device. This is
better for memory usage than rsync and better than dd as it doesn't
have to copy empty parts of the disk. It could be used with a remote
device with iSCSI, but since it copies all of the data every time,
it's probably not a good idea. If you're just copying to a local disk
it works great.

--
Tod

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