Too Long; Didn't Read
We were trying backup data in s3 bucket with 1,000,344 and Size: ~130 GB. We noticed it took hours and hours to perform the copy. There is no way to make it faster. The only workaround we found is to run these aws commands in parallel in multiple terminals so they all can operate on different s3 partitions at the same time. When I created a job to copy the contents of the bucket with KMS key encryption enabled got the following error: "Unsupported encryption type used: SSE_KMS"