**Why storage class selection**: Cost vs. access frequency. At scale, wrong class = millions in waste. **Standard**: Low latency, frequent access. $0.023/GB/month. For hot data—active pipelines, real-time analytics. **Intelligent-Tiering**: Automatically moves objects between access tiers (frequent, infrequent, archive) based on access pattern. No retrieval fees. $0.0025/GB for monitoring + tier-specific storage. For unknown or fluctuating patterns—avoids manual lifecycle....
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