Your data centre has just blown up

Your data centre has just blown up: "

Source Flikr

Just as 9/11 passes I thought this was a pertinent time to say: the fact that your primary data centre will fail is not a question of IF but WHEN (ok that sounded a bit like FUD). Still, it pays to be prepared and unlike most security risks this real not theoretical and the business actually cares if your systems are working (as opposed to secure).