Azure Blob Storage tiers from most to least expensive for storage: Hot (~$0.018/GB), Cool (~$0.01/GB, 30-day minimum), Cold (~$0.0036/GB, 90-day minimum), Archive (~$0.00099/GB, 180-day minimum). Access costs are inverse — Archive has the highest retrieval fees and hours-long rehydration. Use lifecycle management policies to automatically tier data based on access patterns.
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