i've never done a complete nandroid after rooting. first thing i do is delete all the bloat. if you find a way to root the M100 update, I have a brand new, never been used commando sitting right here just waiting to get rooted. then i'd be able to do a complete nandroid with nothing modified except the recovery.
(VZW) Galaxy Nexus. Nexus 7.
& Casio G'zOne Commando - I just use this as a game system and waterproof camera
I love this script ==> V6 SuperCharger