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@Kirth
umm I googled 'galaxy s3 cyanogen install' and found lots of guides showing everything from rooting to installing.
eg: http://xperiahtcrootingrom.com/update-install-cyanogenmod-10-2-on-samsung-galaxy-s3-i9300/
As for your stuff, depends what you want backed up. I never bothered with apps etc... and just let google sync take care of my contacts. A lot of people use Titanium backup for apps.