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The procedure to upgrade is descripted here: http://www.cotonti.com/docs/start/updating#ch2

1. You can create a copy, but you need to copy all files and your database. And change the basis info in config.php.

2. If you go to Siena, all will be done automatically. But all non-siena plugins will be disabled. It will use the default THEME. Your SKIN must be upgraded to a THEME too.
Some tags are changed and there are new one's.

3. This is not a good idea. Because during the upgrade, your database will be upgraded too. There are changes, and an import will use the old info.