Yes, please do not go crazy installing IOS. If a game doesn't work, check this forum to see if there's a fix for it. If you can't find any info you can make a thread and someone here will help you out. But don't be so quick to install, upgrade, or change anything if you're not sure about what you're doing. Good Luck!
Edit: Regarding your backup games. Just make sure you burn them slow (no more than 4X), use good DVD-R media (not DVD+R & Verbatim is preferred).