Backing up a partition with FSArchiver:

fsarchiver -v -z 9 savefs /path/to/archive/file /dev/thepartition

 

Restoring a partition with FSArchiver:

fsarchiver restfs /path/to/archive/file.fsa id=0,dest=/dev/thepartition

 

For more information, see: http://www.fsarchiver.org/QuickStart

 

That should do it!
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