Snapshots are a very easy to use and sophisticated solution to work on multiple (and unlimited) versions of a text you can revert to at any time.
Thus you can create alternatives, try things out - well, just be creative without the hassle to may lose a perfect paragraph or even a whole chapter because of to much editing or deleting.
Simply create a snapshot, add a comment you can search for and if needed, restore from this version with a single click or keystroke and when you later decide that you need another version - just do so…
How to make a snapshot
Use Menu > File > Make Snapshot…