I want to duplicate my slides.
Duplication is now possible via the slide template functionality in the new deck editor. The editor is currently in public beta and enabled by default.
More info about how templates work: http://help.slides.com/knowledgebase/articles/405645
I don't see how this allows me to duplicate a slide. I have a slide, I want to make a copy in case I mess up the original. Or I have slide and I want a second one that is very similar. How do I copy a single slide?