Is it possible to move an entire asset source? S3 is seemingly costing us a lot. While it has its benefits, I think we could do with moving images from s3 to the server we are running the site from. How difficult/impossible of a task would that be?
The easiest way I imagine would be to


Create a local folder
Download all the files into the folder (outside of Assets - via Transmit or similar)
Change your source settings from S3 to Local with correct paths


And you're done. Whoa, that was easy :)