Hi Matt,
Sorry for the extremely late reply, yes the backup is completed in the morning, the tape ejects once completed. When my client comes into the office, they put in the next night's backup tape scheduled for 10pm the following night. I want to stress that all backup tapes are finishing their jobs.
Simply put - when the next night's backup tape is put in the SCSI tape drive (last night's completed backup ejected new backup tape put in for the next night) The tape drive will spit out the tape during the day. The event logs show no record correlating with the time that the drive spat the next night's tape out. I have been sitting at the server when it has done this for my monthly visit.
There is still plenty of space on the tape before compression, (so it is not the tape itself finishing the job off, by requesting another), and it is happening every day - without fail. But not at the same specific time. - any time of the day.
any more ideas?