I have an Intel iMac 2.8 Extreme and every time I try to back it up wirelessly it freezes completely and I have to do a hard restart. It has yet to do it's initial backup of about 55 GB, but I don't care how long it takes wirelessly, I just want it to do it! It has backed up my MBA - 20 GB - fine, wirelessly, but it freezes up the iMac for hours on end, and the only way to get it to unfreeze is to hold the button behind the imac and do a hard restart, which isn't healthy for me imac. Any advice? I'm going to try connecting the time capsule via ethernet tonight and see if I can back it up that way initially then see if it will start backing up wirelessly without freezing.. we shall see.