Via https://seafile.rlp.net the JGU Mainz offers a central sync-and-share-platform (like DropBox and other cloud-services) for students and staff at all universities and colleges in Rhineland-Palatinate. The Data is saved on our own servers and will not be given to external service providers. That is why seafile is a legal and data securing alternative to the commercial services.
Every student gets 20 GB and every staff member 100 GB of central storage space for free. You do not need a special registration. You can not just share your data and work on it with other students or staff members, you can also share it with collegues of other research facilities.
(→ Getting started with Seafile)