Yet another way ... imaging Xandros Linux partition
Thread seems 'cold' but people may still be searching for the topic to get advice.
Use Hiren's Boot CD in an external optical drive. The Acronis utility works fine, #3 on the menu. Identifies Linux partition correctly, and makes the original partition-type the default option, during restore.
Total time for user-modifiable partition imaging, about 6 minutes (but I haven't yet added much, waiting to get rid of unionfs, first).
I backed up to an external USB2 drive. For some reason, the Eee wouldn't boot Hiren's when the optical drive was plugged into left-hand port. Moved both connectors (optical, hard drive) to the right side of the Eee, then everything worked, just the same as on the Windows desktop PC.
I have only done this once, but the restored image both verified and functioned correctly: the Eee booted normally to prior state, after the process.