Use your Network to Backup

So you have a Mac with TimeMachine and a whole bunch of network
attached storage? Oh, sorry... that's not enough to save your precious
data. So time to buy a TimeCapsule or an external drive, right? But
you say isn't the point of a backup to be *off-site* so in case
anything happens to wherever your computer it won't happen to your
saved files?

You'd be right and thankfully, there *is* a way to backup to your
network, you just have to bend the rules a tad.

Lucky for you (me) someone has already worked out the details:
http://code.stephenmorley.org/articles/time-machine-on-a-network-drive/