I have been having problems with 10.2.5 and want to use the info held in the previous system to return to 10.2.4 but there doesn't seem to be any Apple functionality to do this.
So what is the point of the previous system folder(s)?
Also - when upgrading why does the upgrade move all 'extras' such as fonts, wallpapers, microsoft drivers etc out of the current system? It is such a pain having to get them all back in - to get back to where the Mac was prior to the upgrade.