This isn’t a technological answer, but set up a trust fund for the purpose. None of us know what web hosting or its equivalent will be in 109 years, let alone 5

This isn’t a technological answer, but set up a trust fund for the purpose. None of us know what web hosting or its equivalent will be in 109 years, let alone 500, so the only real solution is to ensure there will be somebody around whose job will be to sort that out.