You could even use a batch file to automate the switch even for example:
set datafolder=C:\Games\Steam\steamapps\common\fallout new vegas\set savefolder=C:\Documents and Settings\Administrator\My Documents\My Games\FalloutNV\if exist "%datafolder%\Data1" goto restoremove "%datafolder%\Data" "%datafolder%\Data1"move "%datafolder%\Data2" "%datafolder%\Data"move "%savefolder%\Saves" "%savefolder%\Saves1"move "%savefolder%\Saves2" "%savefolder%\Saves"goto end:restoremove "%datafolder%\Data" "%datafolder%\Data2"move "%datafolder%\Data1" "%datafolder%\Data"move "%savefolder%\Saves" "%savefolder%\Saves2"move "%savefolder%\Saves1" "%savefolder%\Saves":endpause
You would have to make a copy of the data folder in the same directory named Data1 and one in the saves directory named Saves1 initially and then you would just run it and it would switch out the two folders automatically. You'd probably have to edit the directories for your data folder and save folder as well.