I remember seeing an HN article about a stone disc that could keep your data intact for 1000 years. I can't seem to find it. All that comes up in search is something called M-Disc
M-Disc is a DVD made out of stone that lasts 1,000 years
https://news.ycombinator.com/item?id=2868296
https://www.extremetech.com/computing/92286-m-disc-is-a-dvd-...