Duplicati is an open source free backup program that creates backups with the ability to store them securely encrypted, incremental and compressed on cloud storage services and remote file servers. At the moment it has the ability to work with Amazon S3, Windows SkyDrive, Google Drive, Tahoe LAFS, Rackspace Cloud or it can use your own SSH, WebDAV, SFTP or FTP file server.

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Duplicati – An Open Source Powerful Free Backup Tool (LinOxide)