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Hot / Warm / Cold Tiering — lifecycle policies and cost vs latency
Moving data to cheaper storage as it ages — tier classes on S3, GCS and Azure, lifecycle rules, and the latency you trade for the savings.
The trade-off I'd flag
Tiering saves money only if retrieval is rare. Model access patterns before setting lifecycle rules, or the first audit query from cold storage will cost more than a year of hot storage.
