Multi-Region Failover Planning

By Felix Adler · August 24, 2026 · Operations

Multi-region failover is mostly decided before the incident. The two questions that matter - how fresh does the standby data need to be, and who is allowed to press the button - sound managerial, but they drive every technical choice downstream from replication topology to health-check placement.

Data is the long pole. Application tiers scale horizontally and redeploy anywhere in minutes; a two-hundred-gigabyte database does not. Asynchronous replication buys you availability at the price of a recovery-point gap, and knowing your actual tolerance for that gap - in minutes, in euros - changes which fancy technologies are even admissible.

Practise the cutover on a schedule. Teams that failover quarterly stop fearing it; teams that never do discover, mid-incident, that DNS TTLs, TLS certificates and one forgotten cron job all angrily disagree with the runbook.