Being a Windows user I am always wondering why Windows uses so much diskspace. One of the resasons are that Windows always saves older copies of system files after an update. After each Windows Update more and more of your precious disk space is occupied by files that might not even is needed to run the system, they are saved “just in case”.
Luckily there are useful tools that can remove superseeded files from older updates.
by running this command in powershell
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DISM.exe /online /Cleanup-Image /spsuperseded /hidesp |
you will remove backups of files created when installing the latest service pack.
If you are lucky it will free up some disk space, otherwise you will probably see this message
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Service Pack Cleanup can't proceed: No service pack backup files were found. The operation completed successfully. |
which means that the backup files are already removed (or never created).