title: Where are CloudWatch log data stored?
body: <p>Is there some document available that shows how AWS CloudWatch log data is stored at AWS?</p>
  
  <p>Especially, I would like to know:</p>
  
  <ol>
  <li><p>Is an existing service (e.g. Amazon S3) used for the storage of events?</p></li>
  <li><p>Is there any encryption available?</p></li>
  </ol>
  
  <p>Interestingly, information is available for CloudTrail, but there seems to be no documentation about CloudWatch.</p>