(grins a sly grin) By the way - there is one more part called "the application" I never restore them myself but I hear tell that a database with out web server, app server and such is not useful.
I disagree (smiles) I use the database all day long without every having to log in and use the app. :-D
Seriously, (sigh) there is more to the system than just the database.
1) Web and app servers
2) AD servers for authentication. SA works fine for me but .....
3) Tape/Disk backup servers to backup my backups.
4) Routers, and other hardware.
5) Bathroom and vending machines. I've been surprised at how many DR discussions about DR sites never, *never* discuss security, bathrooms, vending machines or where we will live/stay. Some how everyone will go to the DR site and laundry, living, etc will just take care of itself.