I really want to use this guide to root my phone, but I am a little anxious that I will lose the ability to return to stock 2.2 frg01b if I go ahead with this (incase i need to take it into the VZW store). Is it possible to perform a nandroid backup of my stock 2.2 before installing the update.zip file? And if so, between which steps would I do that? Thanks A Bunch!!!