This is handy and extends S3's use case by making two-way sync straightforward. My long-term storage is in Amazon Glacier; I wonder how much effort it would ta

This is handy and extends S3's use case by making two-way sync straightforward. My long-term storage is in Amazon Glacier; I wonder how much effort it would take to extend this and make a straightforward process to pull the data from Glacier, sync with S3 and then push back to Glacier.