Open the Command prompt by typing in cmd or command in the taskbar search.
Create the backup directory where you wish to send all of your iTunes backups.
Alternatively, you can either move this folder to another location or delete the folder entirely. A useful name would be Backup (Old) so that you know what it contains.
In the folder that opens, there should be a folder named Backup.
This should open the default location for iTunes backups.
On the Run window type in %APPDATA%\Apple Computer\MobileSync.
To do this, you can either press the Windows key + R on your keyboard or type in run on your task search bar. If you’re using Windows 10, then the steps you can follow would be: Symbolic links redirect any files copied into them onto a different location. In order for your iTunes auto backup to copy files onto the directory of your choice, you’re going to have to trick the program with a symbolic link. How to Change the iTunes Backup Location on Windows 10