The dsnapshot script provides a high-level interface to the Linux Logical Volume Manager. It uses its block-level snapshot support to create directory snapshots. In contrast to block-level snapshots, directory snapshots resemble the file system layer. Thus, you can snapshot any directory that is on a logical volume and you don’t have to worry about the actual logical volumes, mount points and paths.
encrypted bandwidth-efficient backup using the rsync algorithm.
filesystem-level backup script