I have a 1.5TB external HDD that I am using with my iMac. But I have just added a MBP, so now I have two computers that need backing up. I was thinking of time capsule, but someone suggested I just get an airport extreme and hang the 1.5TB drive off of that. Is that do-able? But also the MBP only has 2 USB ports (my old Dell had 4). If I got the extreme, could I split the USB port and have both a HDD AND a printer off the extreme? Now that I say this out loud (or type outloud), this seems unlikely, but I thought I should check.