>>eloran+(OP)
A couple years ago Panasonic and Sony partnered with the Japanese government to come up with an (alternative) standard that's similar to m-disc in its properties.

The standard that they came up with is called "Archival Disc" (AD) [1] and they fulfill the requirements of 100 years (lab tested and verified) data retention. The ODA units, however, cost over 8500$ last time I checked.

As far as I know you can order them from the Panasonic Japan website and not anywhere outside Japan, but this standard has huge potential in my opinion (when compared to the absurdly overpromised mdisc, for example).

Data retention rates matter, always have an optical and a spinning HDD backup. SSDs are not guaranteed to keep data longer than 30-90 days without electricity.

[1] https://en.m.wikipedia.org/wiki/Archival_Disc

>>thrwwy+8d2
The post is referring to erasure coding or similar, which you can add to your files with a tool like PAR2.

You need to spread the files (including the redundancy codes) over enough disks that you expect to be able to access sufficient blocks in the future.

https://en.wikipedia.org/wiki/Erasure_code

https://en.wikipedia.org/wiki/Parchive