I run a website and I keep a mirror of its contents on several machines at home and one on a backed up account at a local college. I update the website by updating one of my home systems and copying the changed files to the website provider. Once a previous provider lost all of the website and when they got the site back in operation I just reloaded the site. This is a site with static pages so it would be more complicated with a data back end but surely not that much harder.
I talked with a Paychex IT person who said that they have 6 duplicate versions of their data with UPS backup etc. Even with a city wide power failure of a week all of their servers continued to function perfectly.
If data are your crown jewels you should protect them.