how can i backup stock ROM of samsung galaxy y?I am new to rooting.i have rooted my phone but not flashed a rom yet. I want to flash custom ROM but i dont want to take risk.I have tried CWM for backup but it fails everytime.at secire.android and i also tried after fromatting the sd card then it fails from sd ext......After searching google i found a discussion reated with this and someone said that nandroid backup of gingerbread is not possible.is this true? is there another way to backup and restore backup safely?