In the last years, the technological improvement and the resulting miniaturization of processors and electronics gave small satellites new capabilities and performance, previously possible only with larger satellites. As the development made possible to inexpensive and high-quality imagery as well, more satellites have been used for Earth imagery purpose and, in the next few years, this trend will not change easily. The smaller mass also allows to achieve lower launch cost, therefore giving access to space to universities and non-governmental companies. This played as a breakthrough for the entire space economy. Since the beginning of XXI century, this increased usage led to bigger attention by customers for any kind of failure, that can affect the spacecraft at any moment.