Backstitching?
Do you do this when you piece?
If so, when/where?
I do not - because I have not been able to do "neat" backstitching - the fabric rumples or I wander off the previous line of stitching. It also adds thickness - and I've read a gazillion posts about using thinner thread to reduce bulk in the seam line.
I do use a shorter stitch length when strip or paper piecing.
I also will edge stitch a pieced border to keep it from coming apart - which I learned to do after I had a pieced border that came apart.
I have learned so many things by having to do re-dos!