This plugin can be useful if you are going to move your blog to a different site. There are many options that needs to be changed if the URL of your blog changes, at least ’siteurl’ and ‘home’. This is normally done manually updating the values in the database table wp_options, since you can not reach the WordPress administration sites if these URLs are wrong. If you use a plugin that makes use of Google Maps you need to update the API key as well.
DF FileConf prevents the configuration update until you are confident that your changes are correct.