During the last decade, we assisted to an astounding revolution in the computer world. The widespread usage of internet-enabled applications, together with the advent of community-based interactions, completely changed our concept of collaborative work. One of the most important steps in this direction is the development of new technologies for data object storage, able to guarantee high degrees of reliability, while permitting the access in a nomadic environment through heterogeneous devices. In this chapter, we will study the problem of implementing a global data object storage system, exploring the current state of the art for correlated technologies, and surveying the most interesting proposals.