BD-R is a finicky format at 25 GB, and 50 GB and 100 GB are more finicky to the point that 25 GB is likely the best medium. But I know of nothing on the planet that can replace this medium, which by some estimates will be playable after 100 years in storage. Can we do that with hard disks or SSDs? We cannot! I own a considerable stash of BD-R today, but it appears unlikely to last until a suitable replacement is found. Perhaps Sony would be open to donating to me at least few thousand that they don't want?

Is there a realistic prospect of no electric power or electronic control, outside of the shop air provision? Because pressure transducers, patient sensors, etc. probably aren't on the shelf at scale. So possibly to 3-D print enough to keep certain categories of patients alive? An overpressure relief valve can be as simple as a water or mineral oil column, and if set up correctly, will never fail due to software. But the overall pressure and respiration timing, can this be mechanically managed from printed components? Second follow-up, would shop vacs (as blowers) be a more compatible starting point than shop air compressors?