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[Xen-users] what to backup Xen partition with?

Hi all,
I choosed to install my domUs on separate partitions.
All are "full virtualized" domUs.
I have 4 x 10GB to backup. Of course, the backup is done while the domains are 
The domains are 4 different Linux distributions I make tests on.
I might  brake some, and dont want to go more time thrgouh the install 
process: I just want, if I brake the domU system, to just overwrite the 
partition with the last known good configuration.
For the moment, the idea I apply is to "dd" the partition to a file and then 
bzip2 it. for a first install, It goes from 10GB to 1GB (more or less, 
depends on the distro).
But it's still too slow (dd+bzip2). Would you know another way to make 
partition backups?

thank you

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