Some applications will be important enough that having an ability to recover to the same (or similar) hardware isn’t enough. Take email for example. If your client has an Exchange server running and wants to make sure it can be recovered within an hour with data no more than 4 hours old, that’s an absolute standard. It means no matter what, you have an hour. Period. What if you have no network, no server hardware, how about no building? You have an hour!
How in the world are you going to meet such a strict business recovery need?