I'm planning on installing nVidia proprietary drivers on my Ubuntu 10.10.
Historically this always ends-up with me being left with no graphical interface. No ability to revert - and reinstalling the whole system.

So now, before trying this anew, I wish to backup all relevant config files.
I'll try 1 or 2 methods. I'll list each one's commands.
I'll appreciate if anyone can tell me how to backup the relevant file, or what's the reverse of this operation.
10x, David

Method I - as described here:

1. apt-get --purge remove xserver-xorg-video-nouveau
2. As described in this answer: edit /etc/default/grub and add the line GRUB_CMDLINE_LINUX="nouveau.modeset=0"
3. sudo update-grub
4. Reboot
5. Install original drivers downloaded from nVidia site.

Method II - as described here:

1. sudo apt-get purge nvidia*
2. [possibly 'sudo gedit /etc/modprobe.d/blacklist.conf' adding 'vga16fb' 'nouveau'
3. sudo apt-get install nvidia-glx-185
4. sudo modprobe nvidia
5. sudo lsmod | grep -i nvidia
6. sudo nvidia-xconfig