[imadfy]

Redundancy! You should be able to switch to your business continuity backup in less than a minute. Come on, people! It isn't that hard to keep the previous version running in read only mode from a read only DB, then recover by enabling writes on the back-end, spooling the transaction log from the false start over to it, turning off front-end read only, and going live!

[jazoom]

That sounds like all the combined costs of administering that would be less than the cost of a 1 hour outage once per year.