Knox - Knox offers easy disk image encryption and comes with a built-in backup service.

Dropbox - Online Sync and File Sharing

Exocet - Exocet creates a Folder on your System.

ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.

R-Crypto - R-Crypto is smart data security and disk encryption software that allows you to secure your sensitive information via strong encryption.

Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.