I don't know if it makes sense, but something I thought of is: What if Amethyst stored all user posts encrypted with their own key? Then, if the relays go down, Amethyst redistributes from the copy it has. It's a good way to not be so dependent on the relays and not need to have your own relay. About the relays going down, any specific reason? Legal issues, lack of resources, or something like that?