Windows 10 Update Backup Files
When you upgrade to Windows 10 from an earlier version of Windows, a copy of your old system is stored in a folder named Windows.old. If something goes wrong with the upgrade, you can use the backup files in the Windows.old folder to restore your old system.
The Windows.old folder is automatically created the first time you upgrade to Windows 10. The folder contains your old system files, user profiles, apps, and settings. The folder …
