During recent years, the adoption of cloud computing by companies and individuals all over the world has been expanding at highest pace, because outsourcing of computing power is more flexible and often cheaper than setting up an own dedicated computing center. Today, cloud computing represents a major business sector, which generates several hundred billion dollars of revenue each year. The trend continues and the cloud computing industry will grow by about 16 % annually throughout the upcoming years. Nevertheless, computing resources remain expensive, mainly due to the high costs associated with procuring and maintaining hardware on the providers’ end, as well as the huge margins, which are a result of the market’s monopolization. Meanwhile, all over the world innumerable private and business computers are idle during most hours of the day.