Within this paper a secure peer-to-peer (P2P) based storage system is presented with additional features and some simulation results. The main motivation for such a system is to provide the functionality of a cloud storage without having to rely on central servers or large datacenters. Users of the proposed P2P storage system are able to store their encrypted files at other users and vice versa, providing availability at the cost of some extra storage space. The system motivates fair behaviour by using reputation points. We investigate the possible optimal user behaviours and the bandwidth/space trade-offs based on simulation results.