Yeah, but hard copies on what? Discs, paper, what's the medium with the 10K year time horizon ?

Wait, I got it. Stone Tablets. Just have to get a Google project off the ground to inscribe all the worlds code in slate.

Considering all the bits and pieces of plastic we have manufactured will be around on this planet until well after we are gone I would take a guess at saying plastic film would be best.

We can call it Project Alphabet.