Platform & DevOps·Running it: capacity, failure and recovery
a scaled-down copy runs continuously with the data replicating, and recovery is a scale-up rather than a build-out.
Warm standby
Also calledpilot light, hot standby, standby environment
Keeping a smaller but live copy of the environment running, ready to be scaled up on failure. It sits between a cold rebuild from code, which is cheap and slow, and full active-active, which is expensive and instant, and it is where most disaster recovery designs land. Its recovery time is dominated by whatever cannot be pre-warmed — caches, connection pools, scaling limits you have never hit in that region.