I was thinking of ways to archive simple data for a long, long, long time. So I thought of punched tape with data stored as 7 bit ASCII. Just go with me on this :-) Something like:-
The above is actually aluminized Mylar, but looks like what I'm asking about. For example, my PGP secret key is approx 7000 characters long. I would need $\approx$18m of tape for a standard 'paper' tape dot pitch of 0.1". Which I'd hope to store rolled up in a can.
Can this be achieved with stainless or titanium?