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It might be handy if the user could create a copy of a project. This could be useful especially if the user is trying something new and wants to do quickly variations of the same project. Creator is using "Save As..." action for this purpose. The action makes a copy of project sources and project settings.
No immediate plans to implement such a thing. Should be considered alongside delete, rename, & move, I guess (though it is simpler to implement than any of those).
Of course the copy operation should omit any subdirs (like nbproject/private/) which are marked as ignorable by SharabilityQuery.
Copy project action has been implemented in NB5.0, I only forgot to close this issue.