The loss of MiniDisc as a recording format is tragic, especially for archival purposes like this. If it had just been a little more popular, we might have serious amounts of magneto-optical storage now. Nigh-indestructible, doesn't degrade over time as long as it's kept below the Curie point, nearly infinitely rewriteable... I've literally never had a MiniDisc go bad, though keeping the players running in the future may be an issue.