Actually apologies if you are thinking 'Why doesn't this guy just try it'. I've got quite a lot of stuff on my ext3 SD card which is the only thing that I have that's big and fast enough for me to NAND backup onto.
Just want to be sure that I'm not heading into a 4 hour round trip to nothing if I have to tar everything off (or maybe dd it), reformat to FAT, NAND backup, install, try all the things that I want to try and then decide I'm into my rollback position.
All responses greatly appreciated.
- Andy