How do I change the backup location from local disk C:/ to D:/ on a Windows 10/11 PC using the new Apple Devices app ?
Apple devices app 1.4.7.62
you use subst or disk management to mount another volume as a dir
Assign a mount point folder path to a drive. | Microsoft Learn
to choose where the backup is stored
Locate backups of your iPhone, iPad, and iPod touch - Apple Support