[scarface74]

You don't have to "design for it". The default storage class for S3 is your data is automstically copied across three data centers. You have to explicitly specify "reduced redundancy". Yes you pay for it, but you don't have to do anything special.

[toomuchtodo]

Not three data centers. Different zones in the same geographic datacenter. Significant difference.

[scarface74]

I purposefully didn't use Amazon's wording because it would be confusing to someone who doesn't know about AWS.

An "availability zone" is an isolated data center. A "region" is a group of availability zones that are geographically isolated but somewhat close to each other.

For instance, three availability zones (data centers) that are within 100 miles (making up a distance) would make up a region.

[toomuchtodo]

All of AWS' "zones" are very close to each other based on measured network latency between zone resources.

[scarface74]

They are not in "the same geographic data center".

Amazon says:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-re...

"Each region is completely independent. Each Availability Zone is isolated, but the Availability Zones in a region are connected through low-latency links".

Backblaze hosts everything in one non redundant data center.