rsync to readynas

export RSYNC_PASSWORD="password"
rsync -avzxr --progress localfiles rsync://username@192.168.1.1:/sharedFoldername/

mount using nfs:  (network file system, the linux standard)

sudo mount 192.168.1.1:/data /mnt/nas

This required,

sudo apt-get install nfs-common

on the machine attempting to connect to the nas.