AWS S3 storage copy functionality

Question

How does any storage provider gives copy functionality, for instance aws S3 is giving bucket to bucket copy, where does the actual transfer of bit happens? On executing the copy cmd using aws sdk it does wait for copy to complete but none of the bits are transferred via my machine.

Answer 1

When you copy files from one S3 bucket to another ( ex - aws s3 cp s3://bucket1 s3://bucket2 ), the process of transferring data will happen in the AWS owned private networks or over the public networks (internet). Files will not get downloaded from the source S3 bucket to your computer and re-uploaded to the destination bucket from your computer.