https://reincubate.com/support/ipbe/change-itunes-backup-location/
- Open the default Backup location in Explorer using the Windows Run command. Press
⊞ Win+Rand the Run window should appear. Enter%APPDATA%\Apple Computer\MobileSyncand press⏎ Enter. - The Explorer window that opens will show a folder named “Backup”. This contains any iTunes backups which are already present on the computer. In order to change the backup folder’s location, this folder must be renamed, moved or deleted. As an example, one could rename it to “Backup (Old)”.
- Once the “Backup” folder has been renamed, moved or deleted, a symbolic link can be created to the desired backup location. In order to do this, a Command window must be opened. By holding
⇧ Shiftand right-clicking in the recently opened Explorer window, users will see a menu with the option “Open command window here” or “Open PowerShell window here”. Click that. - Use the following command
mklink /J Backup "[desired-new-backup-path]". Once this command has been entered, press⏎ Enterand the change will be complete. - After restarting Windows, iTunes will store its backups in the new location.