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Objects on S3 are replicated on 3 AZs (datacenters) by default and I can't find any info on B2 if they also replicate the data on multiple DCs. That can definitely change the cost per GB for them if that's the case.

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B2 has 99.999999% durability

That's just 8 9s. S3 has 11 9s.

Depends upon your client SLA then. You can also store the file twice on B2 for still less than the cost of S3 :)

Will failures be correlated then?

Then you should be comparing it to reduced redundancy S3, which is cheaper than regular S3.

That’s nice in theory, but if B2 has a castrophic disaster in thier one data center, that durability goes to zero.

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