Yes, you want Clockwork Recovery. After unlocking, rooting, re-downloading your apps and setting up your phone the way you want it (assigning custom ringtones, setting up your alarm app, adding wifi networks, etc...), the first thing you should do is create a nandroid backup. Later on, after flashing ROMs and trying out other stuff, if you ever want to go back to a rooted stock setup (like if you want to download an OTA), you just restore that stock nandroid backup.
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