problem backing up

Feb 27, 2008
ok, im trying to backup my iPhone before i try a jailbreak and it wont work. im working on windows and when i go into the preferences there are no backed up iPhones so i do a sync. after a few seconds it stops and i go back into the preferences and nothing is there. tried rebooting both the computer and the iPhone and still no luck. i thought it was suppose to automatically make a backup when you sync?