SCHEDULEs will show BACKLOG = YES when a new copy of the schedule and its jobs are brought into the current workload.
If the SCHEDULE runs daily and the schedule does not complete when the next autoscan occurs, the schedule will show BACKLOG = YES.
If the schedule runs only on Sunday, the schedule will show BACKLOG = NO after autoscans for Monday through Saturday if it has not completed. If the schedule does not complete when the autoscan occurs for the following Sunday, the schedule will then show BACKLOG = YES.