From Storm Backup:
Storm Backup is an online backup client that's simple and easy to use. It protects your important files and photos by storing a copy of them online in a secure location. Then no matter what disaster befalls your computer, you'll always be able to recover your files quickly and easily. Simply select the files and folders you want to keep safe, and Storm Backup will intelligently back up only what's needed automatically, or manually if you prefer. Standard features include open/locked file support, differential backups, compression, multiple file version archives, bandwidth throttling, private key encryption. Paid plans allow sharing of multiple computers on the same account. Version 1.1 improves user interface and includes minor bug fixes.