Hi David - If you click the SAVE button on the map you should then see a SAVE AS NEW ROUTE button. This lets you save a copy of the route with a new ID and name leaving the original route intact. We're keen to avoid cluttering the map with extra buttons and overlays.
I modify my route when I need to make it more chalenging. I want to save it before I edit it so my original route is preserved. Can't you put a "Save route as" button someplace easy to find? Like right on the route map?