Duplicati is a free backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. It supports targets like Amazon S3, Windows Live SkyDrive, Google Docs, Rackspace Cloud Files or WebDAV, SSH, FTP (and many more).
It is available for Windows, Mac OS X, and various Linux distributions (Ubuntu, LinuxMint, Redhat, OpenSuSE, ...).
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