I'm about to do a migration from Raid-5 to Raid-10 and add some hard drives. But before I do that I think it's good to have a complete offline backup. So I have a 1 TB external hard drive ready to put the backup on. But what software do you use for such an important backup? In the past I used Ghost, but I'm not sure if that's a good idea considering this is a Raid system. And in case of a failure I don't want the Domain Controller to freak out.