PeerDB uses SSH Tunneling for securely connecting and replicating data from Postgres databases to various targets such as Data Warehouses, Queues, and Storage. SSH Tunneling is a method that creates a protected pathway for data transmission over unsecured networks by encrypting the information exchanged. PeerDB leverages this technique to access protected resources securely and cost-effectively while minimizing the need for complex infrastructure. The setup involves configuring a Bastion or JumpBox and setting up firewall rules, after which PeerDB automatically sets up and uses the SSH Tunnel to connect with the protected Postgres database.