An inexpensive data storage technique utilizing available capacity in individual computer devices connected to a network is provided. When a backup client (BC) (14) of a user PC receives a backup instruction for a file from a user, the backup client (14) requests backup to a backup control server (20)....http://www.google.com/patents/US7337331?utm_source=gb-gplus-sharePatent US7337331 - Distributive storage controller and method
