Goldstar Software sells the Double-Take line of data replication products (formerly from Vision Solutions, currently owned by Carbonite), because these products have been tested to work perfectly with the PSQL database engine that we support.  However, the pricing of the Double-Take solution is determined by many factors, such as the machine type, the OS edition, the type of protection you need, and more.  Please contact us to discuss your exact needs, and we will be happy to send you a formal quote!