: iTunes does not have a "Change Folder" button. To store backups on an external drive, you must use a Symbolic Link (Symlink) . This involves moving the "Backup" folder to your external drive and using a command (like mklink /d on Windows) to trick iTunes into thinking the folder is still in its default spot.
💡 Each backup folder is named with a long string of random numbers and letters (the device's UDID). Look at the "Date Modified" column to identify which folder belongs to your most recent backup. Can You Change the Backup Location? backup location itunes