With LvBak you can backup your LVM volumes easily and efficient in Linux. LvBak is written in  Ruby and can be used for free under the terms of the  GNU General Public License ( Open Source).

LvBak creates a new backup revision by hardlinking the previous backup und updating that new revision with rsync - thats fast, space saving and efficient because only the changed files are copied. In contrast to conventional incremental backups, you have always the full directory tree of alle saved files of your filesystems in every backup revision.

LvBak is hosted on  GitHub.