All claims of information longevity assume that the storage medium will be shielded from the elements. Neither paper nor micro-etched metal disks will last more

All claims of information longevity assume that the storage medium will be shielded from the elements. Neither paper nor micro-etched metal disks will last more than a few years if left outdoors. For stone plates designed to last millions of years, a safe loation might be a vault 100 meters underground in impermeable bedrock in the middle of a large craton. Also choose a low-latitude location to prevent glaciation during the next ice age, stay far away from major faults, and try to predict whether your craton will drift over a known hotspot during the time frame you're concerned about.