Make Image of Hard Drive

[Phusion]

I recently built a FreeBSD server, and was wondering how I can make an
image of the hard drive. I am going to build an another FeeBSD server
using identical hardware. How can I make an image of the hard drive of
the original server I built and copy/install it to the new server?
Each server has a 6.4 GB hard drive. Is there a way I can create an
image then install via the network to a new server in the future if
need be? Let me know.