In one sentence
Multi-AZ protects availability within one Region; Multi-Region addresses regional disasters, global latency, or residency.
Key points
- Multi-AZ uses isolated Availability Zones connected by low-latency regional networks.
- Multi-Region requires explicit replication, routing, failover, consistency, and operational design.
- Multi-AZ is generally simpler and less costly but does not protect against a full regional outage.
Exam takeaway
Choose from failure scope, RTO, RPO, latency, compliance, and budget.