Devise\Pages\PageVersionManager::copyPageVersion PHP Method

    public function copyPageVersion($pageVersionId, $name)
    {
        // get the old page version we are currently working with
        $oldVersion = $this->PageVersion->findOrFail($pageVersionId);
        // create a new page version
        $newVersion = $this->createNewPageVersion($oldVersion->page_id, $name, $this->UserHelper->currentUserId());
        // copy all existing fields from oldVersion to newVersion
        $this->copyFieldsFromVersionToVersion($oldVersion, $newVersion);
        // copy all existing collections from oldVersion to newVersion
        $this->copyCollectionsFromVersionToVersion($oldVersion, $newVersion);
        // return the new page version we just created
        return $newVersion;
    }

 /**
  * Request page version be stored
  *
  * @param  array $input
  * @return PageVersion
  */
 public function requestStorePageVersion($input)
 {
     return $this->PageVersionManager->copyPageVersion($input['page_version_id'], $input['name']);
 }