Storage API

Storage API is a Drupal 7 framework for enterprise-level file storage and serving / streaming.

It has the following features:

• Pluggable architecture - it can be extended to work with any CDN, e.g. Amazon S3, Rackspace.
• Redundancy - it can be configured to store your files in multiple CDNs and instantaneously change which one is serving. This means your site will not be brought down by a CDN having problems.
• Access control API - can be used for e-commerce.
• Deduplication - when files that are identical are stored in the same container, only one instance will be created. This saves bandwidth and storage.
• Integration with Drupal core file and image fields.