Alex Pankratov :
Nov 21, 2017
"Access denied" means that Bvckup 2 process lacks privileges required for the requested operation.
It's probably the SACL copying that causes the error.
Accessing SACL requires a process to explicitly ask for SeSecurity privilege first, but the program does that. However this does require process user account to be in the Administrator group in the first place.
Check that you don't have any errors logged around this operation - search %LocalAppData%\Bvckup2\bvckup2.log for "AdjustTokenPrivileges". If you see
2017.09.18 21:54:45 Function AdjustTokenPrivileges() failed with ...
then we can have an error code and see what's up.