I have a different use case. I need to do a backup to disk and then duplicate to tape for performance reasons, but I don't have enough disk to hold the entire backup (it's on the order of 10TB and could get bigger). I would like to set up a job to back up roughly one tape's worth (LTO-4, 800 GB) to disk, then duplicate it to tape and repeat until finished, allowing the disk files from the previous cycle to be overwritten once they've been duplicated. How can I accomplish this?