Is there a device to sync documents from a COMPUTER to Amazon S3 or Azure Storage?
I assume ExpanDrive http://www.expandrive.com/ does specifically what you're seeking. I would certainly additionally second the Jungle Disk referral - the included incentive being the assimilation with the iPhone application etc that ExpanDrive does not have. Yet ExpanDrive is a one - time cost, in contrast to a month-to-month price.
You can make use of the software located at http://www.superflexible.com/. It is not free and also is occasionally not one of the most instinctive to make use of - primarily as a result of the myriad of alternatives readily available.
Yet it does sustain syncing to S3. It can be set up to go for set periods or see a folder for adjustments and also you can run it as a solution so it is primarily unseen.
There is a solution which permits you to access an S3 pail with rsync, http://www.s3rsync.com/
They bill for the transmission capacity in/out and also a per hour cost (billed by the min) for accessibility to their rsync web servers within Amazon's EC2. Being within EC2 you're not billed for the website traffic in between your S3 pail and also their web servers yet you will certainly still need to pay S3 storage space prices in addition to the their costs.