“SpiderOak provides innovative virtual personal network services that simplify the process of backing up, accessing, organizing, sharing and synchronizing data from any number of computers or external storage media. The company is the first to offer the ‘SuperCloud’ - protecting a user against data loss, making all stored information available 24x7 from any Internet connected device, allowing password-protected ‘ShareRooms’ for easy sharing between family/friends/colleagues, facilitating cross computer cross platform synchronization, and providing a variety of technical advantages for efficient and cost-effective data management.”

Going to try this out, does it really offer a zero-knowledge environment?