Tod Detre wrote at about 09:53:57 -0400 on Monday, April 11, 2011:
 > 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.
 > 

Is this any better than using clonezilla with an ext2/3/4 partition on
an lvm-snapshot? (my understanding is that clonezilla "knows" to skip
unallocated blocks).

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