"Save As" is the same as the old "Copy". That would be my first choice for copying a project if you are going to rename files in a new project to be unique and especially if you maintain folders for common purchased parts.
Pack and go simply zips all the necessary files up and then you can unzip them to another location. You get an exact copy of everything.
Ken Production: SE 2019 MP8, Testing: SE 2020 http://Grundey.blogspot.com