Someone should reimplement this for use with cheap laser engraving machines so we can make physical backups on any material like stone, wood, stainless steel, or plastic.
How cheap are laser engraving machines? For ultra critical keys and generationally important data this sounds like a really good idea. I use M-disc currently but an engraved A4 or Letter size scannable durable material seems like the best option if it is available.
Since it seems to accept an image, the question is what material would be best to run it on and then have it be scannable well on a standard flat bed scanner, which almost certainly will be available in some form as long as our current civilization survives.
Not sure but if you want to use a flat bed scanner then maybe if the engraving is deep enough you could just ink the plate and then press a sheet of paper onto it and scan the paper instead.
Edit: would this work?
https://a.co/d/5fWJaEa
Since it seems to accept an image, the question is what material would be best to run it on and then have it be scannable well on a standard flat bed scanner, which almost certainly will be available in some form as long as our current civilization survives.