There has been a lot of talk about software or services that will take images of a server and duplicate the data in the event of a failure. Then when something happens the one server crashes the other server automatically spins up and is completely replicated. Now I know that you can have exchange replicating within the organization and have DFS but this is not what I am referring too. I am referring to Double Take or Storage Craft. I would like to know what is out there that users are using. Have any of you used one of these solutions and liked it. I have heard that double take is not the best.
The primary questions is what software / service / server combo is out there to constantly be duplicating my server in the event of a failure, and which is the most automated.