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Colder storage classes trade a lower per-gigabyte rate for retrieval charges and a minimum storage duration. Deep archive at a twentieth of standard pricing is compelling until you retrieve, and the minimum duration means deleting after two months is billed as six. The break-even depends entirely on how often the data is actually read.
Class cost
storage = TB x 1000 x per-GB rate x months; retrieval = retrieved TB x 1000 x retrieval rate x months; early deletion is billed to the minimum duration
When more than about 3 to 5 percent of the data is retrieved monthly. Retrieval charges then exceed the storage saving.
It moves objects automatically based on access, for a small monitoring fee per object. That fee makes it uneconomic for very large numbers of tiny objects.