Backup on one tape

We have erased the tapes and now it seems to be working...

If i am not wrong, it will work only for the first occurance of the jobs. Because of erasing, all medias will be come Overwritable and not appendable. When the first job starts, it will overwrite a media (let's say media 1). Second and third jobs will append data to same media as that is the only appendable media available to use. 

But during the second run, BE will use an overwritable media (let's say media 2)to startoff with the first job. When second job starts, two medias media 1 (because of infinite append period) and media 2 will be qualified to use. BE will use media 1 because of the oldest allocation date. Which means you are again running into the same issue as earlier.

To resolve this, you should set the append period to a value lesser than your jobs recurrence period. Set it to 20 hours (if the jobs are running daily). As the tape used on first day can be used only after 28 days which means you would be needing a minimum of 28 tapes with this strategy.

Note: If your setup is running as you expected, go on without making the above said changes. Otherwise change the settings and provide us the updates.