Backing Up Files
Whether you are performing a new installation on a previously used server or upgrading an existing server, you should perform a complete backup of the data and operating system before you begin your new installation. This way, you have a fallback plan if the installation fails or the server does not perform the way you anticipated.
When performing a new installation on a previously used server, you overwrite any data that was stored there. In this scenario, you have to use your backup tape to restore any data that you want to recover.
Conversely, if you are going to upgrade an existing server, a known good backup will enable you to recover to your previous state if the upgrade does not go as planned.
Note
Many people back up ...
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