How to back up the rules of Windows Firewall in Windows 2003

Normally, all Windows-Firewall rules in Windows 2003 are stored at a specific key shown as follows.

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy

Therefore, backing up the key above is able to back up all rules. Whenever recovering rules is in needs, importing the key is able to achieve the purpose right away.