I don't think that a world where most of the personal data of the world is stored on servers of a hand full companies is a good one. ownCloud is a free software project that offers a decentralized alternative to proprietary cloud services where everybody can run an own cloud service comparable with Dropbox but on own hardware and with full control. More and more people store their personal files and documents in cloud services like Dropbox, Google Drive, Skydrive or iCloud. The reason is that they provide convenient features to sync your files between devices and share them with others. We are heading full speed into a future where a huge piece of the personal information of the world is stored in very few centralized services. Questions emerge what the impact on user privacy, surveillance, lawfulness of content and storage cost will be in in the long run. I don't think that a world where most of the personal data of the world is stored on servers of a hand full companies is a good one. This talk will discuss the problems of a future with centralized cloud file sync and share services and will present ownCloud as a possible solution.