AWS cross-AZ data transfer costs more than they tell you

The short version: cross-region and cross-AZ data transfer costs the same.

AWS Calculator only works for infra structure. People still forgets about indirect charges.

Believe me, they're making a killing $$$ there.

A survival tip if you have 10TB of data to replicate across regions.

Share via VPC across replications(you will increase latency a bit but saves around $10.00 every sync.

In case you do this every hour, it's like saving the price of an car.

Images? Share via VPC.

Don't use any managed service.

Thinking on it, that doesn’t surprise me as much as I’d expect. My understanding is that different AZs within a region are physically implemented as different buildings, which are some distance apart. So you’d need the same type of network hardware for the inter-AZ links as you’d need for inter-Region links.

This pricing only seems make sense when the two instances are belong to different owners that are billed $0.01/GB both. But still ridiculous: Data transfer in from internet is free, but from another zones/regions cost $0.01. Maybe they just want to make the pricing "look cheaper"?

What about GCS? They say cross-AZ is free, and cross-region is the same 10c/GB. Is it really so, or like with AWS?

That is ridiculous. Does anyone know if that's the case with GCP / Azure too?

Charging for the sending and the receiving of the same data within a region, huh?