There are wireless harddrives out there. Depending on what you want to spend depends on the features. I don't know what your set up is, but if you have the AirPort Extreme Base Station, you can just attach a cheap external harddrive to it and your problem is solved. The angle for the Time Capsule (I have one) is that it's simple plug and play with regards to Time Machine along with a AirPort Extreme Base Station. So, if I do the math, I get 500 GB of storage for around $130, not bad. Through the complications of wanting wireless storage and a network printer, then using AirPort Extreme Base Station creates that problem because it has only one USB port, so I have to pick which one I really want on the network.