Wikipedia
TeamDrive is a German software and cloud service provider offering file synchronization, storage, sharing and secure collaboration for enterprise working groups as well as for individuals via the Internet or any LAN environment. TeamDrive ensures the protection of your privacy, as per the regulations and standards of the Independent Center for Data Protection in Germany (Unabhängiges Landeszentrum für Datenschutz Schleswig-Holstein), for file sharing and provides online data backups. With the free version of TeamDrive you receive 2 GiB of free storage in the cloud. TeamDrive 3 enables users to synchronize data between desktop computers and mobile devices ( smartphones and tablet computers).
The software is available for Windows, Mac OS X, Linux, Android and IOS with four account levels: Free, Personal, Professional and SecureOffice. Each account starts with 2 GiB of free cloud storage but can be upgraded either for free via a customer referral program (an additional 250 MiB per referral and up to 10 GiB total) or via upgrade packages.