RE: back ups??
I set both of my bows up with same site, similar rests, same peep, and same type nock set. Other than a mild difference in their draws, at full draw, looking through the peep, you can't tell one from the other. The older bow releases with a good bit mor handshock, but still shoots well. I actually took both out on different days this year, just depending on how I felt. I also Robinhooded arrows with both bows just 4 days apart, so they were both tuned pretty well also.