I've tried all those commands, the only one that worked is the adb pull /system ./system , it didn't work for etc and data, reckoned there weren't any files to copy. the cat... ones just didn't do anything. I'm guessing this is because I'm not rooted on the phone. Any suggestions?
Google Nexus S (rooted stock)
Past phones: HTC Hero, MDA Vario III, MDA Vario II, MDA Vario I, MDA Compact, HP iPAQ H1930 (PDA)