Durability and Availability - AWS Storage Services Overview

Durability and Availability

Because a CDN is an edge cache, Amazon CloudFront does not provide durable storage. The origin server, such as Amazon S3 or a web server running on Amazon EC2, provides the durable file storage needed. Amazon CloudFront provides high availability by using a distributed global network of edge locations. Origin requests from the edge locations to AWS origin servers (for example, Amazon EC2, Amazon S3, and so on) are carried over network paths that Amazon constantly monitors and optimizes for both availability and performance. This edge network provides increased reliability and availability because there is no longer a central point of failure. Copies of your files are now held in edge locations around the world.