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https://support.steampowered.com/kb_article.php?ref=9609-OBMP-2526
The game data on your account ? No, the games are tied to your account forever and cannot be removed by uninstalling Steam.
That way it stays.
Appdata folder and documents contain things of games and other things. You should back them up.
Appdata on C might be invisible. Do the setting to see.