Google Professional Cloud Architect: Multi-Region Design on Google Cloud

A multi-region architecture is not simply a single-region system copied twice. It is a deliberate response to a failure requirement: the business must continue serving users when a region becomes unavailable or when a regional dependency can no longer meet its objective.

That decision changes data replication, traffic management, deployment, testing, security, cost, and operational ownership. Google Cloud’s reliability guidance treats regions as failure domains, which makes the architecture question less about geographic variety and more about what must remain usable after one entire domain is lost.