Yes, in your environment it sounds like the path should be \wwwroot\Data\Sites\1\skins
So your new skin would reside in the following directory:
\wwwroot\Data\Sites\1\skins\[skin_name]
I recommend you also copy at least one other skin: the folder and contents of \wwwroot\Data\skins\printerfriendly to \wwwroot\Data\Sites\1\skins\printerfriendly
Jamie