Truly exciting advances in DNA-based information storage are being made, resulting in something that is robust, lasts thousands of years and has very high density compared to flash memory. And they announce “commercially viable technology within five years”!
Hopefully, some self-generating “archive of human knowledge” will one day be designed: a DNA fragment that, when put into some appropriate medium (e.g. your basement lab, or even an ocean on some distant planet that harbours reasonable chemistry), starts producing a biomachine that is a kind of tablet computer (with touchscreen and sound), and said biomachine will then be used to read the data contained on the rest of that DNA fragment (where the actual archive of human knowledge has been encoded).
Then put that at several locations across the solar system and beyond, for good measure.