An active-passive multi-region deployment runs a primary region serving all traffic and a secondary region holding a synchronized copy of the data. The secondary region still consumes electricity continuously. The reason for this standby consumption is that:

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Accepted Answer

The standby servers must remain powered and synchronized so that the secondary region can take over quickly when the primary fails.

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The replication stream from the primary needs the secondary's network equipment to be active even when no servers are running.

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Regulatory rules in most jurisdictions require that a backup site demonstrate continuous operational readiness through power consumption.

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Cloud providers bill for the secondary region whether or not its servers are actively powered on at any given moment.

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An active-passive multi-region deployment runs a primary region serving all traf...

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