[Ryan07]

I'm having this same issue. When I try to run a backup from recovery, I get the "Use nandroid-mobile.sh" message, but I don't know what files could be missing. It fails through adb also. In addition, I can't create a backup from ROM manager so I must have some files missing from my SD card.

As admission of guilt, I formatted my SD card for some reason through my PC, so I ended up breaking SD and USB functionality. I got those fixed but I'd like to make a nand backup before going full root.