A long-term archiving medium

When I think about the enormous amount of digital data we’re gathering as a species, I get the same uneasy feeling as when someone keeps all their files on a single laptop — with no backup.

In 3001: The Final Odyssey, Arthur C. Clarke suggests that a large electromagnetic pulse erased vast amounts of data from humanity’s digital memory banks. Digital data, for all its abundance, is fragile — vulnerable to time, power loss, and catastrophic events.

I keep thinking that we might need a non-digital way to archive and preserve digital data. Here would be what I consider the requirements: