What does S3rsync service offer?
S3 storage protocol is "all or nothing" meaning that you can not modify a file on S3 and even for a minor change you have to upload (S3 PUT) the whole file again. This implies that backup and synchronization to S3 are inefficient. If you modify even 1 bit in the file S3 forces you to upload the whole new file again, not just what was changed. So you are wasting bandwidth and the backup process is significantly slower!
S3rsync resolves this limitation and allows you to use Rsync bandwidth efficient algorithm that enables to upload only partial files that were changed. This is done by connecting to our Rsync servers located inside Amazon facility (Ec2). Using this functionality enables you to fully benefit from Rsync power. Now you can save Amazon bandwidth cost and reduce your backup time!
Example: A daily backup of one giga Outlook PST file When using common S3 backup and synchronizations utilities the whole one giga is uploaded every day. When using our S3rsync service only few parts of the pst file, that were actually changed during the last day, will be uploaded compressed.