This is a blog post copied from John's Website - please feel free to join him there and post comments. He has set up openid, so you can post there with your livejournal account using your openid, which is the same as your journal url minus the http://. You can find this entry at http://www.jcfiala.net/blog/2012/08/27/useful-drupal-module-stage-drupal-proxy.
Here's a useful module that I keep forgetting the name of, so I wanted to note it down: Stage File Proxy. It's not something you use for a live site, it's something you use while developing.
The basic idea is this: you're working on a site that's since gone live, making changes for the client. It's easy enough to get a copy of the database, but the files can be a pain to keep replacing, interlacing test files with live images. Stage File Proxy fixes this by snooping in on imagecache and, when a file is missing, then it grabs it off of the live site, copies it to the local directory, and then you've got the file locally and all your imagecache files get generated for you!
There's a version for six and for seven, and there's no ui for it yet, although there is a patch for it. Then again, once you've got the simple settings done, you don't need to worry about them again!