iTunes stores your iOS device’s backup file in a default path on Windows. The location of this folder varies depending on your operating system.
Click in the menu bar, then enter ~/Library/Application Support/MobileSync/Backup/
\Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
1. The AppData and Application Data directory are hidden by default; you will need to enable “Show hidden files” within Windows Explorer.
On Windows 8/8.1/10, you can use Ribbon’s View tab, and click Options.
In view tab select “Show hidden files and folders” and click Apply button.
On Windows 7 or Vista, please click Organize button in any folder and select “Folder and Search Options” from the menu. And then you can select “Show hidden files and folders” in View section of Folder Options window.
2. To quick access the Application Data or AppData folder, just type “%appdata% in search bar, click OK, and then double-clicking these folders: Apple Computer > MobileSync > Backup.