If you are alright with USB drives or network location for destination of you backup then in my recommendation the Backup Exec for System Recovery for Small Business Servers
Its is an imaging application and u can run FULL and Incremental images
In the event of a disaster u can even remotely recover you server if it has RILO or DRAC for a remote restart
The recovery takes minutes to complete and the server restarts to a pre-disaster state
It will also allow you to recover individual item eg mails or mailboxes from the image using the Granular Restore Option
for more information refer to the following
Symantec Backup Exec System Recovery 8.5 General Information
http://support.veritas.com/docs/306981