Page Types for which Revisions History Exists
Previous revisions are available for only certain types of pages.
Recovering a Previous Revision
If you deleted your web page created within Website Builder, there are no revisions to recover. However, if you modified your web page that you created from within Website Builder, and you would rather have the previous version of your web page of at least 10 minutes ago or longer, then you can recover one of your previous revisions.
Note: Revision are not meant for permanent backup. Revisions are temporary in case you need to revert to a recently saved version.