> I wonder if most of the cost comes from S3 This current cost comes from the big dataset of storage in S3. > it wouldn't surprise me if it's the network cost

> I wonder if most of the cost comes from S3 This current cost comes from the big dataset of storage in S3. > it wouldn't surprise me if it's the network cost Network cost is only outbound. Inside it's free (except multi region etc). Ec2 <-> S3 is free bandwidth (you pay for requests).