Ensuring high information availability in tactical edge networks is a critical and challenging issue since such networks are characterized by wireless links that have limited capacity and are prone to disconnection. On one hand, in such a scenario, data duplication could be implemented as it increases information availability through redundancy and accessibility through proximity. On the other hand, data duplication has repercussions on information security. The attack surface becomes more broad as there are more nodes that may be targeted to obtain the information (with each node also having access to more information), thereby potentially increasing the overall risk to the information being compromised or leaked. In addition, data duplication utilizes more resources, in terms of storage, computation, communications, and power, thereby increasing system requirements. It is therefore important to study the various performance tradeoffs that are inherent in the secure and efficient operation of tactical edge communications networks.