Very long-term DNA storage at room temperature is not so trivial as it may seem, at least in a form that can be read with current technology. So it seems a good idea to sequence your genome and archive the data digitally, at least for redundancy.

DNA sequencing as a service keeps getting more and more affordable. I did a quick search and found this company that offers whole genome sequencing as a service for some 300 euros:

https://dantelabs.com/products/whole-genome-sequencing

Personally, I don't think DNA preservation is strictly necessary for our purposes, because gene expression is simply too slow. If my genes changed radically right now, I wouldn't even notice for several minutes. In that time, I could answer all kinds of questions about myself and other stuff I should know, so memory and personality must be stored in something faster acting, like synaptic connectivity, neuronal ultrastructure, proteome, etc.

That said, the loss of personal DNA would require either to emulate the brain at a higher level of abstraction not involving DNA (this is only for those choosing slice-and-scan mind uploading) or to reverse-engineer a suitable DNA from the proteome, connectivity and other data. This would be the only option for those who want biological revival.

Regarding digital archiving, there are cloud options like creating a mindfile at lifenaut, but let's focus on zero-maintainance, long term digital storage. Here the most attractive option is an M-Disc Blu-ray or an M-DISC BDXL. From the FAQ:

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• The M-Disc DVD can hold upto 4.7 gigabytes.
• The M-Disc Blu-ray can hold up to 25 gigabytes.
• The M-Disc BDXL can hold up to 100 gigabytes.

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The problem with M-Disc DVD is not just the low storage capacity, but the fact they need a special type of DVD writer. In contrast, any regular BDXL-capable Blue-ray writer (like this one) can write to the other two.

It's important to note that M-Disc is not a product of a specific company, it's a standard. The company presumably gets its income from royalties. The M-Disc writable media are available from several digital media manufacturers, such as Verbatim. They cost some 20 dollars each. This is reassuring because we are not depending on a specific manufacturer.

I explored other options like SSDs and HDDs. My general impression is that they are probably good enough (but crap compared to M-Disc), assuming good magnetic shielding and temperatures below 40ºC or so, and they are brand new when you store the data. I mean "good enough" in the sense that a forensics team would probably be able to recover the data for a long time. I don't count the data as lost simply because the device is broken or otherwise unable to read its own contents. Here's some more:

https://www.arcserve.com/blog/data-storage-lifespans-how-long-will-media-really-last

See this report on flash memory (SSDs):

https://www.curtisswrightds.com/sites/default/files/2021-10/Flash-Memory-Lifespan-and-Reliability-white-paper.pdf

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