From Blue Marketing: (existing DashClicks client)

Currently, Sites app only has "undo last edit" button. Would be great to have a Revisions tab where previous versions/changes made to the site are recorded in case it gets deleted or if draft did not save.

Reference: https://wordpress.com/support/editors/page-post-revisions/#:~:text=In%20your%20WordPress.com%20Dashboard,Post%20Settings%2C%20look%20for%20Revisions.