Dropbox - Online Sync and File Sharing
LiveDrive - Unlimited online backup storage for your PC or Mac with a 14-day free trial
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
NovaBackup Software - NovaBackup Software is a cloud-based backup software that is intended for the windows system, allowing you to store your files, documents, and much more.
Mega - Secure File Storage and collaboration
Mozy home - Mozy home is one of the effective and secure online Backups that allows you to keep your documents saved all the time, even there is a disaster with the system.