HI Pamela, I am not technical but have used Scrivener on a Mac for around 6-7 years. I currently have version 3 like you. When I edit I create a duplicate file of the book to be edited, rename it with date or something which makes me remember this will be the un-edited version and save it in a folder (or you could put in a different collection rather than starting a new project). I am that sad I have an icon for all my characters or coloured flag or something too.
I always snapshot when I finish a draft and have done every scene in the past but it's just as easy to save different versions or change font or colour . I create loads of folders for deleted scenes, if you have more than one timeline say, or more than one POV. I managed okay but also did a huge post it page on several A3 papers of all the parts of my book and stuck it on the wall so I could see how many scenes each character had, you can do more or less the same on the cork board
At the end of each day I back up now and email it back to myself, (or put in Dropbox if you have it, not gone there yet, but may as it links well with Scrivener).
You can change revision modes to coloured fonts, they are numbered so easy to do, also I put loads of info in the RH side, meta data, project notes, synopsis etc etc.
I could not write without Scrivener as I don't write in order and often do loads of scenes of backstory to get under the skin of them all, I save all these, you never know when you might pick a phrase, you can keep all this in the character folders. For me being able to move it all about is a massive plus.
Also get Kate or Serena in the speech to read it out for you, this helps with punctuation - I am very dyslexic so the more I hear it I feel like I can edit better than reading it over and over.
Sorry for rambling on so much, I know Holly uses Scrivener, so she may be able to suggest more, there are loads of things on YouTube and various Facebook groups too. Hope some of this helps and good luck