How to clear Windows 8.1 old system backup

Many users who upgraded to Win8.1 system reflect that C disk space is getting less and less after upgrading Win8.1 system. What is the reason? In the process of upgrading Win8.1 system, the system will back up the system files of the old system, and get a lot of Windows.old files out, so we can delete the Windows in the C drive. Old file to give C drive thin and slim!

Microsoft Windows 8.1 operating system
Detailed delete Win8.1 Windows.old file method as shown below:

Clear Win8.1 System.old method
If the user who updates to the Windows 8.1 system through the Microsoft Store has such a situation that the C drive capacity is occupied by the Windows.old file, it can be cleared by the above method to make the C drive empty. More useful space.