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> 99.999999999% data durability, data spread over 3 Availability Zones

I'd love to see what source(s) this claim has in practice. How did you arrive at 9-9s? Shouldn't it be spread over 3 Regions rather than Availability Zones, as otherwise it could just end up in the same geographical region while giving the impression it's spread across many.

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It's not my claim, here's the link to the AWS page:

https://aws.amazon.com/s3/storage-classes/#____

You could upload to multiple regions just to be sure.

Also there is afaik no SLA for this! Just marketing.

this is all over AWS documentation; you get the durability via erasure encoding / replication over multiple AZs in one region. Regional blast radius protects again one AZ going down. You don't run a service like S3 across AZs in different regions because of speed of light. if you are paranoid about a region going down you use replication.

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