After doing a recovery /restore that included backups, my disk space diminished considerably, so I checked with WinDirStat and there is a huge folder called Do_Not_Delete and a folder in it called USMT. It is almost 100 GB and apparently it has to do with migration? I have all my files from the backup as I had chosen to re-add them after the system recovery. So can that folder actually be deleted?

Thank you, 

Matt