The protocol doesn’t rely on a trusted central server; instead, all users run a client. Using this client, users publish content by writing a post, signing it with their private key and sending it to other servers which then relay that content along. The relays are simple: Their only job is to accept posts and forward them along to relay participants. These few servers could be censored / shutdown. One could set up new servers....
Discussion
People could even pass around database backups though other channels to make it easier to fire up new clones of that information ready to go