By hand
In the admin
- Open the post in the editor and press the clock beside the header's buttons. Post history opens.
- The versions are newest first, each with who made it and what: Edited, Saved, Published, Via an agent and more.
- Pick a version, and press Show changes to mark what is new against the version before it.
- Press Restore this version. The title, the subtitle, the body and the feature image come back.
- The version you left stays in the history, so a restore is never the last word.