Ok, that's something at least. Let me see...
While it does "sync" and poweroff properly, I didn't add a line to umount the optfs/rootfs after backup.
on the -restore- side, it does have it, though.

I'll add that modification and see if it fixes it.
In the meantime, would you mind trying to restore your previous images? That should work fine. Just backing up might cause a problem.

Edit: Updated version posted in first post as well as: http://robbiethe1st.afraid.org/Backu...0101019.tar.gz