Could not complete the backup because the script timed out. Try increasing your PHP max_execution_time setting.
You can Go to php.ini and set the memory_limit variable to some higher value like 256M or 512M In case if you dont find php.ini file on the server. You can find it here /usr/local/psa/admin/conf/ or in etc/php.ini file. Make the changes and dont forget to restart the server again. To Restart the server you have to run following command : service httpd restart on your command line like putty.