Just do it manually like others said, it only takes 2-3 mins and you're 100% guaranteed it'd work. With plugins it's never reliable.
Just zip entire installation folder and download it to your drive, then export (download) the SQL database of your wp site, and you're done.
Same process to get it back to work; upload the zip file to site's main folder, unzip it (using cpanel), then create a new database and import the SQL file (using phpmyadmin). Make sure that wp-config file in the main directory has the same database name/user/pass as the database you uploaded the SQL file to..