I Tested Win 10 /1909 Backup overwrote D: \ user \ Documents because the item is in the backup destination.
Backup overwrote D: \ user \ Videos because the item is in the backup destination
the system did not report these so the structure of the system has changed i.e. close one drive first when you start!? / appendages which cannot be saved. But still UPDATE DEFENNER.
Makes it easier !!