[Q] nandroid backup and titanium backup

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http://forum.xda-developers.com – I have a few question regarding nandroid backup and titanium backup. 1. If I do nandroid backup of original ROM and then I flash to another ROM, what happens if I directly do restore from the backup from another ROM? 2. What is the difference between nandroid backup and titanium backup? As far as I'm concerned, titanium backup only backup the apps + data. How about nandroid backup? 3. Will nandroid backup, restore all my current states with all the apps + data? Thanks guys. I'm a bit confuse. (HowTos)