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iTunes backup directory is on C drive by default. Many users use C drive as SSD with relatively small space. You can consider modifying and moving it to another drive, or even put it in a NAS mounted drive.
MobileSync directory
- Create a new directory
MobileSyncdirectory on the disk where the backup data needs to be stored, such asZ:\MobileSync. - Find the current backup directory. By default,
MobileSyncdirectory underWindows11is inC:\Users\用户名\Apple\MobileSync. If your own directory is not in this directory, you can search for theMobileSyncdirectory in theCdrive
After having two directory addresses, the mapping relationship can be established.
Map MobileSync directory
Find [Command Prompt], and then [Run as Administrator]

input the command
# mklink /d是建立目录的链接,前面是目前的备份目录,后面的参数是需要的备份目录mklink /d "C:\Users\用户名\Apple\MobileSync" "Z:\MobileSync"
After the execution is complete, iTunes will put the backup in the new directory.
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