SpiderOak will begin offering businesses a way to enjoy its cloud backup, sync, and sharing service from behind a firewall. SpiderOak is one of the few online storage providers–Wuala–that supports “zero-knowledge” privacy. Its client software encrypts data for storage but does not provide a copy of the encryption key, so SpiderOak cannot access client data. One early SpiderOak Blue Private Cloud customer is the Department of Defense, CEO Ethan Oberman says. “Just because your data is online, doesn’t mean it can’t be private and secure,” he says.”]
Source: https://www.darkreading.com/database-security/spideroak-encrypted-cloud-storage-dropbox-alternative