Use %appdata%\Apple Computer\MobileSync\Backup in the Run dialog – that’s the fastest way. Don’t try to open or edit the files inside; you’ll break the backup. Use iTunes or Apple Devices to restore.
Inside the Backup folder, you’ll see one or more folders with long, cryptic names (e.g., 3a4b5c6d7e8f... ). Each folder is a separate device backup. where is my iphone backup on my pc