http://zumastor.org/man/ddsnap.8.html a way to ‘sync’ block devices in ‘rsync’ style. Useful to implement backup of xen VMs based on LVM volumes. Also see http://serverfault.com/questions/27397/sync-lvm-snapshots-to-backup-server
http://www.haifux.org/lectures/153/lvm2.html sort of a lecture slides/presenation that contains a useful explaination how several LVM2 features actually work (i.e. backup)
http://www.howtoforge.com/encrypted-root-lvm Article shows how to encrypt LVM physical voulme partition.
http://www.fedoralinux.ru/content/view/67/37/ [russian] some notes on how to make disk images on remote machines