Backup2Tape Jobs starten nicht nach Backup2disk unter Backup Exec 2012

The Duplicate job is dependent on the Main the job to complete. So if the main job has not completed before the start of the scheduled duplicate job then yes it will get skipped and be auto rescheduled to whenever the next run is (in your case seems to be Friday)

To get around this either schedule the duplicate job to start at a later time or the best way, is to set it to start after the main job completes, i.e following the main job.