i do the diaginal cuton my fabric to .it seemsso much simpler to me .my grandmother used to fold the back of th quilt over to to front an make that her selavage but she also used a sheet for her backs of her quilts .the only way i use a sheet for the back of my quilt is if it is high qulity sheet not a cheepy from walmart.i have picked up a few at the good will that are the higher thread count.an make a betufil backing .matter of a fact i have one i have not used because of the qulity of the thread count in it .it's like a very fine linnen.i want to put it on a very special quilt like on i'm getting good money for our one that i'm going to put on myveryon bed.