Once you have all your pages open in front of you, click the '
' button in the top right.
Once the advanced menu appears, click the '
' option near the bottom of the list.
This will show a list of the most recent updates across the site. You want to click on the update that you want to revert back to. Each save is time stamped to make it easier to find which version you want to roll the page back to.
Finally, once you have loaded up the backup, click the restore button. This will automatically update the page with that version.