Reviewed by Aditya Kumar · Last reviewed 2026-03-24
Architectural difference: Standard-IA = 3+ AZs, 99.9% availability; One Zone-IA = 1 AZ, 99.5% availability, lower cost. Use Standard-IA when: high durability required. Use One Zone-IA when: data reproducible, cost critical. Trade-off: Durability vs cost....
Architectural difference: Standard-IA = 3+ AZs, 99.9% availability; One Zone-IA = 1 AZ, 99.5% availability, lower cost. Use Standard-IA when: high durability required. Use One Zone-IA when: data reproducible, cost critical. Trade-off: Durability vs cost. Best practice: Lifecycle to transition; One Zone for secondary/recreatable.
Red Flag: One Zone-IA for irreplaceable data. Pro-Move: 'We use One Zone-IA for thumbnails and cached ML outputs—40% cheaper; primary data stays Standard-IA.'
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