Whoa... I'm really glad I read this thread. I'm trying out Amon_RA for the first time, as CWM was giving me the amend script error, even on 2.x.x.x. I figured there was no difference in nandroid backups. My plan WAS to get Warm Z up and running and go back to AOSP with a nandroid from today. I will definitely be going back to CWM first, now. Whew. Might have found out what WOULD happen if I hadn't read this... lol.