Paper on a vision for a semi-federated cloud for personal data at ICDCN. Working with Jon Crowcroft, Richard Mortier, Malte Schwarzkopf, and Theodore Hong, we proposed the Droplets architecture as a middle ground between fully centralized cloud services and completely decentralized systems. The work contrasts these two extremes and shows how Droplets enables controlled trade-offs between the costs and benefits of each approach. We demonstrated three sample applications that substantially benefit from this flexibility, providing a more nuanced vision of cloud computing than the prevailing centralized model.