If your PC is connected to the internet, then not so (as Axeia pointed out). Also, even if not connected to the internet, recovering from a backup takes time, … far more time than it does to occassionally type the root password.
A complete hard drive cloning operation is OS independent, and will back up a dual boot setup. Pick the cloning application that is best for you. I used dd the other day on a PC with a triboot (winXP, winME, openSUSE), and it worked fine and it was fast (with the correct parameters included in the command).
This IMHO is bad advice. I recommend all new users to ignore this.
I don’t play games on openSUSE (other than chess, and setting up solitaire for my mother) so I can’t provide recommendations for getting games to run under Linux. Many users retain a dual boot (Linux/Windows) so as to play the games they want on their PC.
openSUSE-11.1 still comes with KDE-3.5.10, which is possibly the best KDE release to date.
I don’t think so. From my perspective, KDE-3.5.10 on openSUSE-11.1 is the best to date.
Again, reference your desire for games, give some thought to running a dual boot operation with openSUSE, and with the OS of your choice that runs games to the extent that you wish.