A startup called Bitcasa has developed a small piece of software that, when you install it, makes the capacity of your computer’s hard drive essentially infinite.

Bitcasa creates the illusion that data stored on distant cloud servers is actually kept on the physical hard drive inside a machine. As a file stored in Bitcasa’s cloud is opened, it is downloaded to the computer as quickly as possible. “The network is good enough that it can be your hard drive now,” says cofounder Tony Gauda. “It performs well enough that you won’t notice that we’re streaming a movie to you rather than playing it off your hard drive.”

Bitcasa is currently in a limited beta; users pay $10 a month for unlimited storage. The software only works on Apple computers, but a Windows version is in development, and mobile apps for smart phones and tablets are planned, too.