I previously used my TC as my main router, connected via ethernet to my iMac and also to an AEBS to give me dual zone wifi (it's a 1st gen. TC without the built-in dual zone). I recently moved and now have a home ethernet network, so I reconfigured things slightly. The AEBS is now the router, connected to a 16-port switch that feeds all the outlets around the house. The TC is connected to this, in bridge mode to expand the network, and is still connected to the iMac directly via ethernet. Well, the bridge networking works fine, as I have internet access on the iMac and I can stream iTunes content from there to either of my Apple TVs over my ethernet network. However, Time Machine backups now "fail", and I have no idea why or what to do about it. This is especially strange as the TC and iMac are connected directly to each other, exactly as they were before I reconfigured the set-up. I have tried resetting / rebooting the TC, but I am wary that I will unwittingly erase the backups on there already. Anyone got any ideas?