X-cart Database Backup/Restore HTTP 500 Error

If you are getting Database Backup/Restore HTTP 500 Error then check your error logs – /var/log

If you will see following entry
[06-Mar-2013 02:52:09 America/Denver] PHP Fatal error: Call to undefined function func_xpc_check_iframe_methods() in /var/www/vhosts/yoursitefoldername/httpdocs/modules/XPayments_Connector/config.php on line 57

then you can try to activate the x-payment module without configuring and see if all works. It is a bug though