there is a great partition backupping tool: partimage. it has ability to work across the network, check it out - "Partimage-manual Network-support". Server part is called: partimaged.
I think that running server on WD site and client on computer from one of many available LiveCDs with partimage is a great tandem.
I propose to port partimaged into WD and make officially available ARM architecture on http://partimage.org/ website ;).
A thread on partimage forum is here: http://www.partimage.org/forums/viewtopic.php?p=2111