Recently, I configured our SBS2008 server to use WSUS. I set up a daily synchronisation, removed the packages that were of no interest / use to my domain and let it do it's thing.
Lo and behold, three days later I noticed that the synchronisation process had been pulling ~11GB/day. After disabling it, our usage went back down to normal levels.
Is this typical of WSUS, or have I seriously mis-configured something?