Best thing I ever heard from the head of archives at the BBC:
Once you format shift, you will always be format shifting.
Keep your originals whenever you can.
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But from fire-resistant storage cabinets, to concrete-lined file rooms, to underground archives, the tech to make archives ~99.5% fire-proof is more than a century old. And if you add redundant storage sites for the high-value stuff...
Vs. anything digital is far more vulnerable to digital malice.