Bitcasa offers unlimited cloud storage that streams all files to any device. It aims to replace local storage like hard drives and SD cards by providing infinite capacity that grows with the user's needs. The document outlines how software has disrupted hardware markets in the past by offering new capabilities like unlimited music and video. It argues local storage can similarly be disrupted by Bitcasa's approach of streaming all user content and caching frequently accessed items, while never requiring backup or running out of storage space.