NFS Backup

With NFS you need to either mount another machines filesystem or export yours. If you mount the other machines filesystem then all you need to do is copy the files to the correct directory. If the backup machine is mounting your filesystem then it will need to do the backup copy.

The disadvantage is that the machines should be close together. You also leave the sunrpc port open for possible hack attempts. This is probably the easiest way to copy files though.