I have pretty much quit stitching backward. To backstitch when I start, I turn the piece around so I am sewing forward toward the starting point, I usually try to mark about 3 stitches out, then when I get to the starting point I turn the work around and still sewing forward go back over the 3 starting stitches and sew it the rest of the way, when I get to the end I again turn the piece around and backstitch 3 stitches sewing forward along the stitch line.
Todd