I agree that a bundled experience has a better UX, let's ask to all the WhatsApp users that try to move between Android and IOS. But a relay is probably excessive as basic backup solution, a client can simply export a JSON blob with all the events or offer to encrypt and upload it somewhere. Of course the "where" can be offered by the client too, with a full integrated procedure.

#[12] the NIPs are the right place to define a standard backup format?

#[5] #[6] micro business idea ^