Overall it is NOT necessary to backstitch at the end of any seam in a quilt. Virtually all seams are stitched over by another seam. The quilting lines can be secured by the "stitch in place" method, which is what I do. For binding I do backstitch 1 or 2 stitches only. I sew the binding onto the front of the quilt, turn it to the back and hand sew it down. I like how you cannot see a stitch line on the binding.