An anonymous reader writes "Cloud-based personal data management is pretty cool... if you don't mind entrusting the entirety of your personal data to a gigantic corporation. Apart from the risks of their doing unseemly things with your data, also the security of your data is entirely in their unreliable hands. So, is it possible to build my own personal data repository, where for example, I can store my contacts and calendars to sync to multiple devices? This could be hosted on any third party hosting service assuming also that all of my data was encrypted at the data level. So even if the host wanted to look at my data, all they'd see is 1s and 0s. What are the options for the tinfoil hat wearing FOSS folks that want to participate in the cloud age?"