Do not use Rom manager, you'll get a brick. A nandroid is a complete copy of everything in the phone. Make it first before deleting anything stock. Its what is used to return it to stock rooted.
CWM makes the nandroid. If you delete something by mistake, an app, you can restore your phone with the nandroid. Not making a nandroid is why so many people are looking for the z990g rom. Its insurance to make a backup/nandroid.
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