It makes me wonder why backing up downwind to keep the LZ in sight and so enable a forward descent / run on in event of an engine failure has any real advantage when in so doing puts more stress on everything and thus more likely to have an engine / tail rotor failure in the first place!
I cringe when ever I see this, using all that power whilst backing up, when you could be doing a towering take off into wind and on your way in much less time.