Are there any technologies today that would enable a distributed backup of IA? Something like BitTorrent, but where I can specify I want to host XXX GB of data, and all the nodes in the swarm would provide a redundant, distributed backup in aggregate? I realize things like IPFS exist, but as far as I'm aware those require manual file pinning. I want to just donate storage and bandwidth to back the files up, not have…
In the end you need a decision layer to decide what to back up that decides what based on some standard of what's good for society.
But maybe you don't need to centralize the storage, I could imagine a distributed IA which mostly piggybacks on other people's storage.