I'm looking for a reliable method to make changes to my design, however I would like keep a folder with my previous assembly preserved for safety. I just wanted to see what others do to not destroy their previous work by accident. I find that it's super tedious work to go through large assemblies and saving each part file as a copy. I was thinking possibly pack-and-go the design I would like to preserve as a zip, and leave it untouched. Would this separate all references than my current assemblies?