NFS is great but if you have a linux server running in the house (I happen to) you could use Rsync to pull the entire drive over to another drive for backup purposes. This is what the Rsync command does:

rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.

Some features of rsync include

* can update whole directory trees and filesystems
* optionally preserves symbolic links, hard links, file ownership, permissions, devices and times
* requires no special privileges to install
* internal pipelining reduces latency for multiple files
* can use rsh, ssh or direct sockets as the transport
* supports anonymous rsync which is ideal for mirroring

I use this command to back up my linux and freebsd boxes to a NAS for backups. Its quick and works, and I am going to try to implient this on my series 2 Directtivo here shortly.