The cloud is changing the way we share data. We can keep data on local workstations and file servers for quick access, but face the challenge of sharing it with a large number of people. Alternatively, we can put our data into one or more cloud storage systems to share it with many other users, but then we cannot access it as quickly or as cheaply. Moreover, local copies of data can get out of sync with cloud copies, causing remote users to see old versions. Our solution is Syndicate, a virtual cloud storage system that composes local storage, cloud storage, and commodity CDNs and network caches to transparently give users the best of both worlds.