Scott Silva writes:
If you want to experiment with a inexpensive NAS with replication, look at Freenas. It can do nfs sharing and automatic replication with rsync. And it is free and based on Freebsd. Still immature, but it has a lot of promise.
Our experience with FreeBSD+NFS has been less than stellar.We had a lot of issues when we tried to use NFS as a mailstore repository in FreeBSD.