Upgraded plugin from 1.1.5 to 2.0
Had to de-activate then activate before I could see the new settings page instead of the old one (though that may be normal).
Attempting to re-authorize to Google Drive gives the following error;
"Authorization failed! Did not receive a refresh token."
Backup redirect URL is correctly set on the app as http://xyz.com/wp-admin/options-general.php?page=backup&action=auth