AWS Data transfer charges – Quick guide
In cloud you can save maximum cost by how well you are designing your environment .If your architecture is not upto mark some times you need to spend more money than your on-premises.Because in cloud each and every resource is chargeable on hourly basis mostly.
More important need to understand data transfer charges in/out for EC2 and other services.
From below table you can easily understand data transfer charges in AWS
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Good info