RetroARCH (https://play.google.com/store/apps/details?id=org.retroarch) just hit the Google Play if you're a fan of them. Supports a bunch of different systems.
If you want to backup and do not want to root, you can always connect your phone to a computer and give adb backup a try. There are some home-made GUI apps that make use of adb that you can try too.
For example: http://forum.xda-developers.com/showthread.php?p=36499906#post36499906 It's just a...
I sure hope this isn't a question on how to download pirate apps...
BENEFIT OF THE DOUBT: Check out this for some nice rooted apps: http://www.reddit.com/r/Android/comments/dctbb/okay_so_you_rooted_this_is_what/
PS: No piracy. C'mon, it's crazy easy on an Android. You don't even need to be...
I feel like school, back when I was actually in school, was more entertaining though, because of how much I get to interact with people, hang out with friends, and other stuff like that. All I get to talk to at work is my boring coworkers lol