找到解決方法了:關閉 iTunes,Mac 使用者在終端機輸入:defaults write com.apple.iTunes DeviceBackupsDisabled -bool falsedefaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool falseWindows:Vista:C: \Usersusername\AppData\Roaming\Apple Computer\iTunesXP:C: \Documents and Settings\username\Application Data\Apple ComputeriTunes orC: \Documents and Settings\username\Local Settings\Application Data\Apple Computer\iTunes使用 XML editor 或 Notepad編輯 iTunesPrefs.XML 檔案. (記得存成備份檔後再編輯)檔案中,搜尋 "backup" ﹣﹣>會顯示:Code: <key>DeviceBackupsDisabled</key><data>dHJ1ZQ==</data> 刪除後並儲存即可