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Keep everything in the Windows.old, $windows.~bt, and $Windows.~WS folders after the upgrade.

Usually the free space needed is at least twice the size of the C:\Windows.old folder.

You will need to have enough free space on the Windows C: drive.

This backup will allow you to be able to go back to the previous build of Windows for up to a 10 days after upgrading to Windows 10 if you should want to. When you upgrade to Windows 10 or update to a new version of Windows 10 (ex: Windows Update), a copy of the previous installation is saved to the Windows.old folder in the root directory of the Windows 10 drive as a backup.

How to Go Back (roll back) to Previous Version of Windows in Windows 10