Comment by joanou

AltDrive (http://altdrive.com) is unlimited, has a free two month trial, and is $4.45/mo or $44.50/yr. The client is lightweight and full featured. Data is encrypted using AES-256 CTR mode with your key before leaving your computer. It supports Windows, Mac OSX, and Linux, has data deduplication, throttle control, and file versioning. It is easy to setup and use and has online video tutorials and a knowledgebase.