As title states: How to make a Copy of a Project/Solution in Microsoft Visual Studio 2012?
It is such a simple option, and it seems to be unavailable.
What I've found to work so far, assume you have a solution folder structure like so:
mysolution
mysolution
mysolution.sln
You then copy (literally Ctrl+C & Ctrl-V) everything so it looks like this:
mysolution
mysolution
mysolution-copy
mysolution.sln
mysolution-copy.sln
Open file mysolution-copy.sln with a text editor and replace "mysolution\mysolution.vbproj" with "mysolution-copy\mysolution.vbproj"
Then open mysolution-copy.sln file with Visual Studio and build it...now it should all work again.