You're completely right, sorry about that. I've read it now. To add, it's not just about the ability to get the data back from the backup. The effort required

You're completely right, sorry about that. I've read it now. To add, it's not just about the ability to get the data back from the backup. The effort required to re-setup every client machine, and possibly replace all of them on short notice, is a significant obstacle. It's also really hard to exercise without significant expenditure.