Is this the proper quilting term? Those little folds that accidentally get sewn into the backing sometimes when you are machine quilting a quilt? I used to really obsess about these. I spray-baste my quilt, securing the backing to the floor and smoothing out the batting and top layers. It's pretty secure. But no matter how much tension I use on securing the backing, when I take the quilt up after basting there are little bumps--not folds, but just like pruned skin when you've sat in the bath too long. The best way I have found to avoid these ridges on the backing turning into tucks is to stretch the whole quilt sandwich firmly while I sew the quilting. This takes care of most of them, but I still get the occasional tuck.
But I have finally noticed that when there are a few tucks sewn into the backing, once I wash and dry the quilt they are rarely visible, especially if the backing is printed. I know they are there, but they remind me that I'm not perfect. I've made peace with the occasional tuck, although I still try to avoid making them in the first place. They prove that I made the quilt, I guess.