Many large Internet-based companies such as Amazon, Google etc. have realised that only a tiny amount of their data storage capacity is being utilised. This led to the “renting out” of space on remote servers or “Clouds”. Information is provisionally cached on laptops, desktop computers, mobile phones and other Internet-linked devices then saved more permanently on the Cloud. Amazon’s Simple Storage Solution (S3) and Amazon Elastic Compute Cloud (EC2) are the best-known services.