What is the best way to Backup the whole system? I have been following
the thread on backup with YaSt but did not want to ask this on it has
it would be slightly off topic.

I current use rsync to Backup up /home but have not figured out all the
parameters to make it the most compact.

I want to backup my 12.3 disk completely before installing 13.2 for
testing. Signature has current system I will be using for backup or
should I completely update 12.3 and then use 12.3 to backup whole disk.

Thanks for any pointers

openSUSE 13.1(Linux 3.11.10-11-desktop x86_64|
Intel(R) Quad Core(TM) i5-4440 CPU @ 3.10GHz|8GB DDR3|
GeForce 8400GS (NVIDIA-Linux-x86_64-331.79)|KDE 4.13.2