To expand a little: Just a computer with a LOT of dvd drives. Add a few high capacity local ssd, harddisk and plenty of ram. Insert disk, optional full copy to

To expand a little: Just a computer with a LOT of dvd drives. Add a few high capacity local ssd, harddisk and plenty of ram. Insert disk, optional full copy to local as cache, then server just reads. If it copied it auto-ejects. Also got a tapes as a backup. Works similarly. Insert tape, it gets copied to the libraries local storage then ejected. We can also just use the tape without copying first. Why optical for email? We can easily store them in a human accessible way. They're supermarket cheap. Quicker than tape as well. Everything on optical is also on tape with no exclusions. Its a pity optical media hasn't reached the point where I can just go buy a pack of 1TB disks from the supermarket. I'm not holding my breath for Sony's Archival disks either.