Help to understand data transfer between AWS zones

Question

Hi team,

I am being billed hard (considering Brazil convertion from USD to local currency), so I am trying to understand some lines
I can see several lines like AWS Data Transfer SAE1-USE2-AWS-Out-Bytes, AWS Data Transfer SAE1-USE1-AWS-Out-Bytes, but I do not have any service on these regions. I only have some domains on Route 53, some EC2 servers, backup plan without region transfer... not clear why I have transfer between region. Any clue please?

Also, there any strategy I can adopt to reduce my traffic to internet? Got a 77 dollars transfer bill only on April.

Thanks and regards

Answer

First of all, you need to use Cost Explorer to identify which services are incurring these charges. You can do so by filtering "-AWS-Out-Bytes" under Usage Type then group by Service.

![Enter image description here](/media/postImages/original/IMFbogrpVsS8CCzsQXjDzXmQ)

Once you identity the services, refer to the following blog posts to further understand why the charges were incurring.

https://aws.amazon.com/blogs/networking-and-content-delivery/understand-aws-data-transfer-details-in-depth-from-cost-and-usage-report-using-athena-query-and-quicksight/

https://aws.amazon.com/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/

Help to understand data transfer between AWS zones

Relevant content