How to create a secure incremental offsite backup in Linux with Duplicity

http://duplicity.nongnu.org/

If you maintain mission-critical data on your server, you probably want to back them up on a remote site for disaster recovery. For any type of offsite backup, you need to consider encryption in order to avoid any unauthorized access to the backup. In addition, it is important to use incremental backup, as opposed to full backup, to save time, disk storage and bandwidth costs incurred in ongoing backup activities.

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Story added 9. August 2013, content source with full text you can find at link above.