iTunes备份目录
iTunes 将备份文件存放在以下位置：Windows XP：\Documents and Settings\（用户名）\Application Data\Apple Computer\MobileSync\Backup\
Windows Vista/7：\Users\（用户名）\AppData\Roaming\Apple Computer\MobileSync\Backup\
MAC:/Users/i（用户名）/Library/Application Support/MobileSync
备份到google
用Microsoft Exchange
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