From BCMpedia. A Wiki Glossary for Business Continuity Management (BCM) and Disaster Recovery (DR).
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1. A business operation can utilise two infrastructures that perform the same function. This makes one of the infrastructure redundant, but it can act as a backup if the primary infrastructure is compromised from a cyber security attack.

(Source: Business Continuity Management Institute - BCM Institute)


2. Redundancy is where a system has been designed to eliminate single points of failure.
(Source: ENISA - the European Network and Information Security Agency. BCM & Resilience Glossary)

3. Redundancy means that if a system or component fails, there’s a backup system in place that can fill in its place.
Source: (PrivateTunnel, 2017)

4. Redundancy refers to the additional capacity in a computer network above what is needed for normal operation.
Source: (Kaldor, 2017)