Nandroid backup freezes

[anon(84069)]

I'm running the G tablet with CM6.1. When i boot into recovery (CWv.08) and run a backup, it freezes after a few minutes and never seems to finish...

Screen shows...
ClockworkMod Recovery v2.5.1-bekit-0.8
SD card space free: 12624MB
Backing up boot...
Backing up recovery...
Backign up system...

I would then have to hold the power button down to turn off the device. Upon reboot, it boots just fine back into CM6.1, but definitely no backup is being made.

Has anyone run into this issue before? Any ideas on what to do?