I think the best solution is one presented here by either of the two experts. I would say...
- Dismount the datastore
- Copy the edb and STM
- Run your nt backup utility that comes with Windows server.
- and mount the datastores again.
Please keep in mind that this is just an approach that should be done if you know what you are doing. Here are some places on how to get more information...
http://technet.microsoft.com/en-us/library/aa996179(EXCHG.65).aspx
http://technet.microsoft.com/en-us/library/aa997165(EXCHG.65).aspx
Good luck.