So i have jailbroken my 32gb 3gs and now when i hook it up to itunes it asks if i want to restore from a previous backup (witch would undo the JB im quessing) or set as a new phone? Will i loose my old back up if i select new phone? And will i use another allowed computer onto this phone? im a newbie and former pc runner so dont burn me to bad, i assume slect new phone right?