SLASHING DATA TRANSFER COSTS IN AWS BY 99%

Summary from the TLDR newsletter

One of the easiest ways to accidentally spend too much money on AWS is by carelessly transferring data. Any application that involves sending data between resources in different availability zones will incur such charges. These prices easily add up and are an extremely high-margin source of profit for cloud providers. This article looks at how to set up cross-availability zone infrastructure without paying for data transfer costs. It suggests using S3, which already replicates data between availability zones as part of its service.