Stage File Proxy saves you development time and disk space.When developing Drupal sites locally, you often face a choice between broken images and taking the time to copy a snapshot of the remote files directory, which might be several gigabytes large, depending on the site. Stage File Proxy lets you update the database of your local development instance without having to update your files directory. Stage File Proxy transfers each requested file just in time when it is requested.
Up RPC is a system for migrating data from a Drupal 5 site to a Drupal 6 site, for use on those site upgrades where the D6 version of the site is an entirely new build rather than an upgrade.
