Ok if the manual backup works then that proves that the drive etc works so something you are doing setting up backup is wrong. For a scheduled task make sure that the schedule starts after the time you input the task or it will never start. For say mondays backup set everything up so the schedule looks correct save the task as a job (or you can't schedule it) then put in the tape and run the scheduled task manually (choose it from the jobs menu). If the scheduled task can be selected and run manually then it should run automagicaly too, you also have the knowledge that the tape has been cataloged correctly and matched to the task. If your task hasn't run next visit check the event logs, task scheduler and NTBackup schedule itself to see if you have an error message when the task was due to run. If you are getting 'the specified media could not be found' - that means the wrong tape was in the drive at backup time.