I was hoping to be able to print wirelessly through an airport (haven't bought it yet), AS WELL AS use it as wireless backup solution with an attached USB drive. Is my understanding correct that I can not do this at the same time because there's only one USB port on the Airport? In other words, to do wireless printing as well as time machine backups, does one have to switch USB connections each time, or is there some kind of USB splitter I can buy (sorry for the naive question) in addition? Thanks.