http://www.duplicati.com/
"Duplicati is a free backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. It works with Amazon S3, Windows Live SkyDrive, Google Drive (Google Docs), Rackspace Cloud Files or WebDAV, SSH, FTP (and many more).
Duplicati has built-in AES-256 encryption and backups can be signed using GNU Privacy Guard. A built-in scheduler makes sure that backups are always up-to-date. Last but not least, Duplicati provides various options and tweaks like filters, deletion rules, transfer and bandwidth options to run backups for specific purposes.
Duplicati is licensed under LGPL and available for Windows and Linux (.NET 2.0+ or Mono required). The Duplicati project was inspired by duplicity. Duplicati and duplicity are similar but not compatible. Duplicati is available in English, Spanish, French, German, Danish, Portugese, Italian, and Chinese........"
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跨平台的备份系统Duplicati
Duplicati 是一个支持 Windows 和 Linux 的开源备份系统，基于C#编写，可将文件定时备份到电脑中的文件夹、Windows或Samba文件服务器、FTP服务器、WebDAV服务器、Amazon S3云端储存服务，甚至以SSH方式备份。备份可通过密码进行加密，数据备份和恢复也可通过图形界面进行。Duplicati更可管理备份历史、设定备份次数、使用的容量上限，也可指定不备份某些类型的文件。
目前支持的备份方式包括(不限于)：
Amazon S3
OneDrive
Google Drive (Google Docs)
Rackspace Cloud Files
HubiC
Backblaze (B2)
Amazon Cloud Drive (AmzCD)
Swift / OpenStack
WebDAV
SSH (SFTP)
FTP
Github源码下载：https://github.com/duplicati/duplicati
