Dropbox is the easiest way to store, sync, and, share files online. There's no complicated interface to learn. Dropbox works seamlessly with your operating system and automatically makes sure your files are up-to-date. Available for Windows, Mac, and Linux.
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SpiderOak provides an easy, secure and consolidated free online backup, sync, sharing, access & storage solution for Windows, Mac OS X, and Linux (Ubuntu, Debian & Fedora)