Standby Redundancy
TL;DR
Your backup system exists but is dormant. Cold, warm, or hot standby? The difference is whether you accept hours of downtime or milliseconds—and how much you pay meanwhile.
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Backup systems are maintained ready but not actively operating. When primary systems fail, backup systems activate.
Business Application of Standby Redundancy
EDF's reserve generation capacity illustrates standby redundancy: reserve generators maintain partial operation or standby readiness, ramping up when needed. Reduces operating costs but introduces switchover delays. AWS Availability Zones use this approach - backup data centers ready to activate within minutes.