There is no need to backstitch when piecing your blocks because the stitching will be anchored when another piece is stitched to it. If we had to backstitch for all piecing that would be the death of strip style peicing and you couldn't possibly do a Bargello style quilt, no assembly line piecing ala Bonnie Hunter. I only backstitch when the final outside border goes on at the edge and when I attach my binding and am doing mitered corners.