Modern systems don’t fail because of a single server or a bad deploy anymore. They fail because entire regions go dark, dependencies vanish, or external conditions and geopolitics shift faster than infrastructure can respond.
For years, High Availability (HA) within a single region was considered enough. Multiple AZs, load balancers, replicas — all solid engineering. But today, that model has a blind spot.
When the region itself becomes the failure domain, HA stops helping.
Across industries, organizations are facing risks that have moved from rare events into part of the operating environment.
Same-region HA protects you from instance failures, AZ-level disruptions, and routine infrastructure issues. In such scenarios, your system is perfectly healthy — but unreachable or unusable. It does not protect you from:
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