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Just to add to what JimLynch said, a custom recovery is a must for rooted android devices. It should allow you to do a nandroid backup to create a "save point" for your device. This is especially important if you flash a lot of ROMS. Trust me, it's just a matter of time until you screw it up, and you want to be able to go back to a pre-screwed up state. It's a lot cheaper than a new phone or tablet.