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原文见：
http://bbs.et8.net/bbs/showthread.php?t=1025959 The default backup locates in:
C:\Users\<user id>\AppData\Roaming\Apple Computer\MobileSync
Example:
Windows user id: yourname
new backup location: F:\iTunes Library\yourname\MobileSync
Step 1.
copy C:\Users\yourname\AppData\Roaming\Apple Computer\MobileSync folder to F:\iTunes Library\yourname
Step 2.
open Command Prompt (run as administrator)
cd C:\Users\yourname\AppData\Roaming\Apple Computer\
Step 3.
rename MobileSync folder to MobileSync.bak
mklink /D MobileSync "F:\iTunes Library\yourname\MobileSync"
Step 4.
test backup
Step 5.
remove MobileSync.bak folder
