Revision History

Announcement restore a specific page 

https://workspaceupdates.googleblog.com/2021/09/restore-a-page-via-history-new-google-sites.html

In new Google Sites, you can now restore a specific page from version history. Previously, you could only restore an entire site. This additional functionality makes it easier to restore, edit, and re-publish specific pages that may have changed by mistake or been deleted.