Nuxeo automatically creates snapshots of versions of objects. You can recover a specific version of the document if needed, without having to edit the document.
These archived versions can be found on the "History" tab ("Archived Versions" sub-tab), when viewing a given object in Nuxeo:
Snapshots of versions of objects are automatically captured, when there are modifications to files managed in the "Main Content File" section of the Nuxeo object.
For more information on Nuxeo versioning, see https://doc.nuxeo.com/userdoc/version/.