With Page snapshots, you can save a version of your page and access it later.
To use page snapshots, go to your page and make sure that you are in the "Appearance" section.
Scroll all the way down until you see "Page Snapshots".
Click "Take Page Snapshot" and then a modal window will open up asking you to enter a name for your snapshot.
And thats it! You now have a page snapshot that you can restore