> That said, if we have a very liberal definition of the word "website" to include any successor technologies where a device can be used to request a document,

> That said, if we have a very liberal definition of the word "website" to include any successor technologies where a device can be used to request a document, given an identifier, that looks recognizably like your webpage, this is doable. Let's not restrict this to "successor technologies." If we look to prior art, the traditional solution has been to deposit a copy of a work in a library. In that light, OP sounds like they're looking for the concept of a "family chronicle."