Preservation

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Add a topic on preservation. Would highly relate to Reference rot, but is a bit different given that reference rot refers to digital aspects.

Could be used to indicate that preservation doesn't reach over just a few years, but over decades to centuries. Would be worthwhile to have a few concrete examples of repurposing of old information for unexpected use. Talk about how everything gets lost except if it gets preserved (lower probability of loss).

Maybe also talk a bit about how storing things digitally does not necessarily preserve them.