rsync server/daemon security

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http://unix.stackexchange.com – I have a NAS (Netgear Readynas NV+) at home and a linux (Arch) box at work that is always on. The linux box is already running an ssh server/daemon and the NAS is already running an rsync server/daemon. The NAS does not support rsync over ssh. The way I understand it is I can either enable port forwarding on my home router to enable my linux box to initiate an rsync with the NAS or I can enable an rsync server on the linux box and allow the NAS to initiate the sync. Since my home router does not have a static ip address, I am leaning towards running an rsync server on the linux box. Is one w (HowTos)