Business Continuity (BC): Includes planning to ensure the continuity of business critical functions in the event of a major unplanned service failure or disaster—including key aspects such as personnel, facilities, crisis communication, project management and change control. A BC strategy includes a Disaster Recovery Plan (DRP) for IT related infrastructure recovery.
Disaster Recovery (DR): Part of a larger Business Continuity plan that includes processes and solutions to restore business critical applications, data, hardware, communications (such as networking) and other IT infrastructure. Can also include measures to protect against other unplanned events such as the failure of an individual server or shorter service interruptions.
Mission-critical: Systems or applications that are essential to the functioning of your business and its processes.
Redundancy: Systematically using multiple sources, devices or connections to eliminate single points of failure that could completely stop the flow of information.
High Availability (HA): A system or component that is continuously operational for a desirably long length of time.
Recovery Point Objective (RPO): The age of files that must be recovered for normal operations to resume if a system goes down as a result of a failure.
Recovery Time Objective (RTO): The maximum tolerable length of time that a computer, system, network or application can be down after a failure or disaster occurs.
Hotsite: A DR facility fully equipped with the equipment, network connections and environmental conditions necessary for restoring your data and getting your systems up and running instantly. (unlike coldsites and warmsites, which are not ready to go in an instant)