Store a copy of things across multiple servers. That's all nostr is doing. I send a message to Damus, Damus stores it. If you're not on Damus, you don't see the message. I have to send it to multiple relays and hope you're also on one of the relays I sent it to.
Nostr would store the rss on multiple relays. http server, only your one server. The redundancy is the thing I find most interesting.
And can we really ignore that relays have DNS?