Always Admin. Permissions are correct for Admin related users. I know what you mean about permissions and win 10 can sometimes be a pain especially with extra drives.

The thing is I wouldn't be able to use my pst with Outlook if the PST file didnt have the right permissions, running as admin or not. Yet it wont allow a backup unless I check the run as admin in the icon, or right click and open as admnin, then all of a sudden backup works. Quite odd.