How to backup data to Amazon S3/Glacier using Amazon’s AWS Storage Gateway (NOTE: This is an unsupported feature)
NovaBACKUP xSP / Remote Workforce
How to backup data to Amazon S3/Glacier using Amazon’s AWS Storage Gateway (NOTE: This is an unsupported feature, it is a workaround for you to try, and NovaBACKUP Technical Support cannot assist you if you have issues with using this method):
http://www.novastor.com/blog/datacenter-backup-to-amazon-s3/