User Friendly Re-installation App?

[Amichai Rotman]

Hi,

I recently tried to change my shell to Gnome3 following this guide:

http://www.ubuntugeek.com/how-to-install-gnome3-on-ubuntu-11-04-nattyubuntu-10-10-maverick.html

I don't like it and want to go back. I understand the only way is to
re-install Natty from scratch (formatting the / partition) and restoring all
installed apps after updating the fresh installation...

My current setup:

1. Ubuntu Natty
2. A few extra PPA sources.
3. Separate partitions for / (root) and /home.
4. A separate hard disk containing backups.

I started to backup my settings and installations:

1. Copy the current /etc to the backup drive
2. Dump my dpkg selections to a file (sudo dpkg --get-selections >
installedpackages).
3. Copy the /usr/local folder to the backup drive.

This got me thinking: What if I forget something? How important it is to
backup the /usr/share folder?

Wouldn't be nice to have some script / GUI app that I run before the
re-installation by choosing "Backup System State" and after the fresh
installation and updates and choose "Restore System"?

Is there such an app?

I'd like to create a cool bash script to run, can you suggest the steps
(what to backup?)

Thanks!

Amichai.
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