1. You CAN.
2. You'd untar it, then cd to the directory of files you wish to move, then:
mv old_public_html/* /path/to/new_public_html

And WGet is a linux command, you can run it from any directory that you have permissions to run it from; but on the site you're grabbing it from, it has to be in the webroot to use wget to grab it.

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