The Environment Indicator settings page allows you to modify some elements of the indicator's behaviour and appearance. Individual settings, such as the text to display and the colour can be overridden for each of your specific environments in the site's settings.php file. This allows you to customise the indicator for each of your environments without needing to make any changes in the database. This means that the Environment Indicator will always display correctly when moving your site from development to staging to production.
Drush Rebuild is a utility for rebuilding a local development environment from, for example, the production environment. Drush Rebuild uses Drush aliases and an easy-to-read YAML configuration file.