I do all my bindings by machine - front and back - and what makes it work for me is that I cut my binding strips one quarter inch wider than most people do..by the time I fold it, stitch to the front and fold fabric to the back, I have an extra one eighth of an inch to give extra leeway to ensure I catch the binding when I stitch in the ditch on the front. I also make sure I pin so that I know where the edge is on the back - I pin perpendicular to the edge from the front and make sure that when I insert the pin the point of the pin goes thru the back binding and as close to the folded edge as possible. This way I know from the front that as long as my second stitching line is between the pin's entry point and the original ditch from the first seam I"ll be catching the back binding in my seam.