Bostr is a new Nostr relay that bounces your  Nostr read and write events to multiple relays, allowing users on metered or mobile connections to save on bandwidth.

You could run one for yourself, your community, or for the general public.

Example: You run a Bostr relay at home and configure your mobile client to only use your home Nostr relay. While out and about, you utilize one relay, saving your mobile data, while the Bostr relay at home handles the heavy lifting and data intensive internet traffic for you, sending your notes and events out to the world.

https://github.com/Yonle/bostr