'Duplicati is a free, open source, backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. It works with Amazon S3, OneDrive, Google Drive (Google Docs), Rackspace Cloud Files, HubiC, Backblaze (B2), Amazon Cloud Drive (AmzCD), Swift / OpenStack, WebDAV, SSH (SFTP), FTP, and more. Duplicati is licensed under LGPL and available for Windows, OSX and Linux (.NET 4.5+ or Mono required).'