Don't support reusing appliances

Author: bdunne

appliances/backup_and_restore.md

@@ -43,7 +43,7 @@ Restoring a backup of the appliance will be done using SSH or the console.
      rm -f /backup.tgz # if desired to save space
    ```
 3. Launch `appliance_console`
-   1. If this is a brand new appliance and the database has not yet been initialized, select `Configure Application`. If this is an existing database appliance, this step can be skipped.
+   1. Since the database has not yet been initialized, select `Configure Application`.
       1. When prompted to configure the database, select `Create Internal Database`
       2. When prompted to configure messaging, either connect to an external messaging system or configure this appliance as a messaging server
       3. Choose a database disk