Do we know the half-life of a digital record?
The first thing that comes to mind is the fictional society from the planet Krypton. They stored data in crystals, likely artificially created diamond material. I suspect we could do this today without consideration for cost.
I was really just asking.
Either way there must be advantages in multiple backups: - DNA - Digital sequence - Crystals - Stone etching
Even with different decay rates they won't all decay in the same way. We can diff multiple records and reproduce a probable original.
(I think - I'm not expert in digital storage or the mechanics of DNA)