Abstract: A system and method for securing data on data network accessible server including computer implement the steps of receiving user data from a remote application over a write-only data interface, and identifying in the first database a subset of received user data as selectively replicated user data and transmitting the identified selectively replicated user data over a secured data interface. The method also includes receiving the transmitted selectively replicated user data over a communicatively coupled second secured data interface and storing the received selectively replicated user data in a transactional database. The method further includes receiving a request for requested user data from a remote application at the transactional database over a read-only data interface and transmitting at least a portion of the stored selectively replicated user data as the requested user data responsive to the received request.