If we have scheduled backup configured in clish on a SmartCenter or MultiDomain installation the backup can't be done if GUI clients are connected:
scheduled_backup: set_binding: Failed to set one binding: :backup:start:local : error = Can not start the operation. You should disconnect all GUI Clients from this SmartCenter. ; val=(nil)
In R77.x there was a tool called disconnect_client.
But what's the best way to achieve the same on R80.x