All our client's servers have mirrored hard drives, often called RAID Level 1. This means that every time a bit of data is written, it is actually written to two hard drives. This means that if one of the hard drives fails you will lose no data. In fact you won't even notice. We will though, because the server will email us to let us know so that we can turn up with a spare and swap it. - This feature is part of the Base Install Module and was added to all our systems on 30th September 2005.