I never tried the C860's backup / restore NAND function ... Maybe I got EVERYTHING the wrong way, but these functions are accessible (in japanese) by turning on the machine while holding the OK button, after taking all power off it ? (it supposedly is in the same japanese menu where you select option 4 to do the OS Update) ....
If I understoof it ok, it would create a HUGE file in an available CF with the whole NAND memory content, thus preserving whatever OS and installed things you could have in there. ....
So this could eventually be a good idea to SHARE different OS configurations among users ??
IF SO, I WOULD LOVE if anyone could post anywhere (hey I have an FTP server !) a NAND IMAGE for a ZAURUS C860 with latest SHARP ROM (I think it is 1.41j) in ENGLISH !
Anyway, most probably I got it all heads up and this can't be done but then...