When I am stitching out an "important" design, and have made adjustments to the size or off center placement, I jot down all the ajustments I've made. Then I can go back to those adjustments and continue on after advancing through the stitches. I hope this makes sense!
That is sure too bad - do try to get back to the right spot - I have done that - when I had a machine that didn't advance to the place that the power went out - I love my machine - if that happens - it will ask me if I want to retreive the design I was working on - I usually do that.
Sorry! If you leave it alone and the power comes back on, just reboot your sewing machine to the pattern again and advance the stitches until you get back to where you left off. Then go back about 20 stitches and it's like nothing happened. That happened to me once and that's what I did. Hope this helps a little. Suzanne