Running win 10 pro SyncToy 2. Have USB 1TB Hd connected that contains previous copy of data.
Created a new folder pair c:\users\owner and I:\users\owner
Synctoy goes through the analysis stage and then creates a result page that has everything in the failed column.
Error message is access denied.
In windows explorer when I copied some files C: to I: it asked for admin privileges then worked ok.