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It is always recommended that when performing an upgrade that the user should use a Development or Test server in order to minimize downtime. You should note any problems you have encountered (and also how to resolve them) before attempting to upgrade your Production server. It also gives you a chance to "practice" at the upgrade. Practice makes perfect, and minimizes problems and downtime. Additionally, if you are using a version control system, such as subversion or git, you can to manage locally developed features or modifications, then you can do all of your upgrades in your local version control system on your development Development server and commit the changes, so that . That way your Production server can just checkout your well tested and upgraded code.