[nmglug] tips on current home backup setups (NAS ?)

Does anyone have a nice FOSS-friendly approach to NAS (network-attached-storage) for a non-technical user? Non-technical, but willing to roll up their sleeves a bit. Simple DYI is fine, but off-the-shelf would be nicer (as long as it's based on free s/w). And any thoughts on which of the user-friendly graphical backup approaches work best with such a NAS type of thing?