There are high density binary microfilm optical formats on archival grade film stock that should be stable for several hundred years. Although tbh I'm an M-DISC

There are high density binary microfilm optical formats on archival grade film stock that should be stable for several hundred years. Although tbh I'm an M-DISC guy. https://en.wikipedia.org/wiki/Optical_tape https://en.wikipedia.org/wiki/Optical_tape -- https://en.wikipedia.org/wiki/Write_Once_Read_Forever https://en.wikipedia.org/wiki/Write_Once_Read_Forever