#nostr #relay #damus

From the nostr web page:

Clients fetch data from relays of their choice and publish data to relays of their choice. Relays don't talk to one another, only directly to users.

For example, to "follow" someone a user just instructs their client to query the relays it knows for posts from that public key.

So if you run your own node, only your own posts will ever be stored there.