Perfect Wiki keeps the previous versions of every page: a new version is saved as you edit, and the last 365 versions of a page are kept on any plan.
They are listed in the Activity panel next to the page (the strip of tabs on the page's right edge; on a phone, the 💬 button under Start editing), together with the page's comments. Every edit is a sentence — who changed which section and when — with the exact words that changed, so you can see what was altered without opening anything.
To go back to an earlier version:
- Open Activity and find the edit you want to go back to.
- Click ⋯ on that edit and choose Restore this version.
- Confirm with Restore.
The page then looks like it did at that moment. Nothing is lost: the text you had before the restore stays in the history as a version of its own, and the restore shows up in Activity as its own entry.
See also: 💬 Page Comments