Openduckbill is a simple command line backup tool for Linux, which is capable of monitoring the files/directories marked for backups for any changes and transferring these changes either to a local backup directory or a remote NFS exported partition or to a remote ssh server using the very common, rsync command.

As a backup tool, openduckbill can operate in any one of the modes mentioned below:

• Maintain an exact copy of the source at the backup destination
• Maintain current and previous version of the source at the backup destination

Features

• Supports recursive and non-recursive backup of files/directories
• Does filesystem monitoring
• Openduckbill uses pyinotify for filesystem monitoring.
• Any directory marked for backup, will be monitored for changes, and the changes will be synced to the backup destination regularly.
• Three different modes of backup. Supports backup to
• Local directory
• NFS mount
• SSH server (using rsync over ssh)
• Include/exclude files/directories from backup
• Supports including/excluding files/directories from backup using pattern matches
• Supports maintaining current and previous versions of files at backup destination.
• In NFS backup mode, the NFS partition is auto mounted.
• Ability to remove files/directories which are not part of backup schedule from backup partition. (Currently this feature supported only in LOCAL and NFS backup modes.)
• Uses YAML based config file
• Easy to read and modify
• Uses GUI dialog box to display critical information
• Has built-in logging system
• Daemon mode and Non-daemon mode
• Extensive DEBUG info mode
• Fully client side application
• Minimal (or no) configuration required on server

More details here