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 你需要用WIN7下的MKLINK, 实际就是一个SOFTLINK, 在UNIX下方便多了,  
微软垃圾就麻烦. 
 
1. Close iTunes 
    Move the existing C:\Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\ folder to the destination drive (for example, D:\) 
    Open a command prompt and create an NTFS junction point using a command similar to the one below, replacing D:\Backup with the path to your destination: 
 
1        mklink /J "C:\Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup" "D:\Backup" 
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