This is the universal method that works regardless of your macOS version.

Open Finder, click Go in the menu bar, select Go to Folder , and paste: ~/Library/Application Support/MobileSync/Backup/ Via Interface: Connect your iPhone to your Mac and open Finder . Select your device from the sidebar. Under the General tab, click Manage Backups .

Press Win + R and type: %AppData%\Apple Computer\MobileSync\Backup\ Summary of Storage Locations Installation Type Mac All Versions ~/Library/Application Support/MobileSync/Backup/ Windows Microsoft Store \Users\[Username]\Apple\MobileSync\Backup\ Windows Apple Website

If you cannot find the MobileSync\Backup folder, you may have never backed up to that computer, or the backup was deleted. Connect your iPhone, open Finder/iTunes, and click to create a fresh backup — then check the folder again.