I keep one. I use it mostly for information because I sell some of my quilts. I put in the name of quilt, date started and finished the top, date started and finished quilting, if quilting was by machine or hand or mix of both, date completely finished, size, name of pattern and where I found it, amount of fabric used and hours of labor, kind of thread I used and estimate of amount, name of recipient and when given or sold. I also leave a space for notes...problems I had, what I would have changed, applique details if applique was used, etc.