by the way, if you also can't find the folder like i did b4
On Windows XP:
C:\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup
On Windows Vista:
C:\Users\USERNAME\AppData\Roaming\AppleComputer\MobileSync\Backup
On Mac:
/Users/USERNAME/Library/Application Support/MobileSync/Backup
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自問自答, 終於找到方法了
http://support.apple.com/kb/HT1766
