Backs up your media instantly to Amazon S3
This plugin is discontinued. To the best of my knowledge it is stable and works fine, but since it's release I have decided it is no longer advisable to store Amazon credentials in PHP files.
Creates an immediate backup of your media to Amazon S3 as soon as you upload it. Vital for when you never want to risk losing your files.
Can also be useful for off-loading your uploads externally to free up disk space on your main site (additional CDN plugin required to make use of it in this fashion)