How can I do a "hot" backup of my Ex2003 volumes without unmount?

Hi all,

I am using a third party backup tool (Handy backup). This backup procedure executes a script for stopping Exchange and its services, and when the backup (priv and public stores) is gone, it executes another script for starting it. My stores are about 12 GB. The problem is that my exchange server is about 10 minutes offline

I would like to find a method for making the backup without unmount the exchange server before. Is there any way for doing it?

Thanks,