ABSTRACT The aim of this work is to design and implement a prototype of a distribu- ted Peer-to-Peer backup system with the usage of the BitTorrent protocol. The system design should let the users to contribute their local free space in exchange of reliable remote storage, which is a virtually co-allocated space on other users’ devices. The result is a functional prototype of such system, which implements the basic idea and shows a concept for further develop- ment.