B2 Glacier
Storage: $0.005/GB/mo === $0.004-$0.005/GB/mo (by region)Upload: Free === Free + $0.05/1000 transactions
Download: $0.02/GB === $0.05-$0.09/GB
Retrieval Fee: Free === $0.003-$0.03/GB + $0.003-$0.03/1000 requests
Retrieval Time: Milliseconds === 1 min - 12 hours
In short, unless you only upload very large individual files, do nothing with them, and don't access any of them for at least 10 years...B2 is lower cost. (And, of course, doesn't required you to wait to get them out.)