I usually shutdown my pc, and use a livecd to make a backup of /, and do:
tar cvfp**z** UbuntuComputerBackup.tar.gz --exclude=/proc --exclude=/sys --exclude=/dev /
I was thinking of now doing (xz compression instead):
tar cvfp**J** UbuntuComputerBackup.tar.**xz** --exclude=/proc --exclude=/sys --exclude=/dev /
Is this a good idea to now use xz compression? What are do you guys reccomend for full tarball barebones backup?