The problem I am trying to solve is to have duplicate notebooks within Evernote, so if I (or someone signed in my account like a helper) makes an unwanted edit, or in some other way messes a note up that I have quick and handy a copy of the original. If we can duplicate a note, why can't we duplicate a notebook is my thought. I have backups, that's not the point. We work on the fly and sometimes things happen like the whole contents of a note gets overwritten with wrong data. It's rare but it happens, just like it's rare for a whole notebook to get deleted, but it happens. We don't have time to go find a backup or mess around restoring. If I could just go to the duplicate notebook it's a super fast fix. Note history is helpful to know about, thank you, and on a note-by-note basis may solve the problem. I'd still like the feature of a duplicate notebook.