A new version of your operating system just got released and you want to have a fresh new install, or you want to migrate all of your data to another machine. There are so much stuff to backup that you don't even know where to start?
I will try to list the most common stuff (on a web-server) to backup or copy somewhere when you want to do a server migration.

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The way I'm going to describe is using the GDM autologin which can be UNSECURE if someone has physical access to the machine.

Activate autologin in gdm by editing /etc/gdm/custom.conf and add:

AutomaticLoginEnable=true
AutomaticLogin=yourusername

Reboot.

Then ssh as yourusername into the machine, and type this:

DISPLAY=:0.0
gconftool-2 --type list --list-type string --set /desktop/gnome/remote_access/authentication_methods '[vnc]'
gconftool-2 -s -t bool /desktop/gnome/remote_access/prompt_enabled false
vino-passwd
gconftool-2 -s -t bool /desktop/gnome/remote_access/enabled true

Reboot.

Then try connecting to your machine using VNC.

Source: By Weboide in How do i install gnome on Debian and remote to it? [serverfault.com]

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