Owl has developed specialized software to replicate and securely transfer historian data across network boundaries. This software interfaces directly with the historian on the source network to replicate its data and then utilizes the data diode to transfer the data to the destination network. On the destination network, Owl can either build a replicated historian from scratch or append data to an existing one. The Owl historian replication and transfer software is an optional feature that runs simultaneously with other applications and can be configured to run on one of Owl’s all in-one data diode appliances (OPDS-100D, OPDS-100, & OPDS-1000). Appliance devices feature the convenience of a single, all-in-one solution, and are capable of supporting the majority of historian data transfer situations. Owl also offers server configurations designed for larger (or a larger number of) historians with very high throughput requirements.