Maybe Jim Lyons can wade in on this one and give us the regulatory intent that seems to be driving some parts of the industry to back-up procedures.
I agree with Spinwing, and I don't know of any pilot that does back up either onshore or offshore. I haven't worked for any employer that endorsed back up procedures as part of their SOP's. The consensus being that you are introducing a hailstorm of real tangible risk for the sake of a statistically improbable engine failure. Like Spinwing, I too have had friends that inadvertently came to grief by letting themselves drift back when coming out of a tight area.