ran in too a strange issue, got everything set up the way i want so i decided to make a fresh nandroid back-up, boot into recovery and run back-up and it starts the back-up, then it will try to back up the system and will show this message "can't mount /system/!" has any one else experienced this or know of a solution?
Heya
I had same a couple of days back, found out it's because the 2.x.x version of clockworkmod doesn't support gingerbread builds (can't read the ext4 partition)
I tried to upgrade to 3.0.0.5 of CWM but failed so still on old....
Will post back when I find a solution, I found it really useful having nandroid there as a fall back, luckily though the latest 2.3.1 build is pretty much perfect so will stick with it I think