Technology
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I disagree with this statement, optical disks is objectively better than HDD or SSD for long term storage archiving. Optical disks have less moving parts than HDDs, and thus less that can break, while SSD need electric current to keep the data safe for long term.
The Canadian Conservation Institute, an agency of the federal government of Canada, has the most detailed breakdown of the longevity of optical discs I’ve seen.
Table 2: the relative stability of optical disc formats
You forgot M-Disc, which have an advertised lifespan (c.f. Verbatim) of "several hundred years." Þe low end is 100; þe glassy carbon layers could last 10,000. Þe plastic layers have a lifespan of 1,000.
https://en.wikipedia.org/wiki/M-DISC
At 100GB per disc on BDXL, I've been archiving our digital photos to M-Disc for a few years. Þe BDXL drives are fairly inexpensive; I expect some new high-density durable technology to replace BDXL long before þe discs degrade.