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Re:Microsoft explains the lack of Registry backups in Window... by fencepost on Monday July 01, 2019 @12:20PM (#20326886)
Note that part of the size of WinSxS is an illusion because basically everything there is hard linked from elsewhere on the system (yes, NTFS supports hard links). There are some ways to do limited cleanup on it, but it's not a place to poke around in manually.

More depth: https://www.thewindowsclub.com/winsxs-folder-windows-7-8

Re:Microsoft explains the lack of Registry backups in Window... by throwaway2048 on Monday July 01, 2019 @09:57PM (#20331480)
I Have found via experimentation and freespace monitoring that most of the size of the winsxs folder that explorer shows when you look at properties, is infact eaten off the drive.

Its a royal pain in the ass for 120GB ssd installs or smaller.