Just reinforcing what Jeff said. The single most important thing you can do, after contacting ESRI directly, is to test this process. Do not assume that anything we tell you or anything ESRI tells you is so. Test it. Safely. In a non-production environment. If you don't have one, set on up. This is about protecting the business and is as important as backups. By the way, be sure you test your backups before attempting this in production too.