[kldg]

interesting. I assume the things I host at home (which is everything) will be recoverable by family at time of my death if they're so interested. I left some instructions in will, but not for things I ought to, on reconsider, like "what" the thermostat is and how to access it beyond the web interface...

-but I do not plan for longer-term than that; I assume if kid cares, she'll bother repackaging it. I am curious about some of the non-book solutions. I think you might be able to rig up a solar solution, burying a box underground with an SBC/mini-PC with SATA or NVMe connectors; the SSD should be fully read from at least once a year. The solar should be degraded-but-fine after 50 years (excluding animal damage, which I find is pretty substantial if you keep them close to the ground... will want redundancy), but the battery will not be, but I haven't been around for long enough to really have a "feel" for how long LiFePO4/other cells will last... I wouldn't be surprised if they could go >20 years with very shallow discharge cycles in a degraded state (perfectly usable for having an SBC read drives once a year), but I'd be very surprised if you could get a standard cell to 50 years.

I tried getting a tape drive a few years ago. I bought a used one off Amazon, but HPE refused to give me the software for it; I wound up refunding it rather grumpily. It'd be pretty surprising if the tape drive lasted for 100 years (edit: interfaceable probably the bigger issue), but under careful conditions with ~no use, the tape cartridge itself should last 30-50 years (with no guarantees; you'll want redundancy on different batches/brands).

I would also add software solutions like PaperBack to the pile of paper storage ideas. Essentially, you create a giant compressed QR code printed to a sheet of paper, and this is like going from storing audio as uncompressed audio on CDs/DVDs to mp3 (DVD-MP3 was underrated!); instead of storing 500 words, you can store an entire book. There's not terrible complexity here, so it should be trivial to reverse-engineer, especially if you include a couple page of notes on how the algorithm works. -or heck, in 100 years, maybe a 50-year-old LLM can simply look at it and read it like you wrote words.