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S3 Storage Class Decision: Access pattern known? → Standard/IA/Glacier

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S3 Storage Class Decision: Access pattern unknown? → Intelligent-Tiering

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S3 Storage Class Decision: Single AZ OK? → One Zone-IA

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Lambda vs EC2: <15 min execution → Lambda

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Lambda vs EC2: Predictable high load → EC2

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Lambda vs EC2: Sporadic/event-driven → Lambda

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