You should be aware that this box being recommended is not traditional NAS storage, but rather NDAS connected. The box does not use TCP/IP to communicate, and you must install the NDAS driver and map a drive letter to the disk to use it.
The latest drivers finally do allow multiple read/write access to the NDAS disk, older drivers restricted write access to a single station.
I have a couple of these, and they have advantages and disadvantages. They're pretty fast as cheap network storage goes, but as I mentioned, they need non-standard drivers.
You could consider something like the Buffalo TeraStation
which is a true NAS and has the ability to connect an external drive for automated backups of the NAS drives.