I think Archive.org wayback machine and archive.today are going to be extremely valuable resources for "historical research" in the future. I hope they can continue their work via donor funding.
It seems like there is some solution which can provide a huge data source to be decentralized over arbitrary number of nodes, where each node can hold or back up just some part of the data, and allow for a dashboard view that shows the level of redundancy over all of the data for each of its parts.