Move one environment's database and files directory to another.
This script currently relies on Drush* and Drush's site alias features. And now that it's using drush_invoke() instead of drush_shell_exec(), you do not need a 'files' key in your site alias. core-rsync has a %files path, so as long as your remote site is reporting that path correctly, this should be able to grab your remote files.
It also will setup dump file locations (source-dump and target-dump) for you if they are not already setup, however, you should still be able to override these options by specifying them yourself, as well as any other options supported by sql-sync.