new tablet questions

Ehm, I got this tablet just yesterday and I have been loving it but I've had some questions:
1. Should I download android 3.2 and if so how do I backup my files before the download and how do I actually do the download itself?
2. Is there a way to keep a tab running while I switch to another, or better yet keep it running once I exit the browser? (My dad likes to listen to an internet radio program called lbc97.3 but I have to stay on the tab in the browser or else the audio stops playing)
3. What is rooting and should I do it?
Thank you very much for any help you can give! :-)

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