On my Windows 7 x64 system I tried to backup my Nvidia display driver.
First I thought it was successful, then I compared the file list with the content of the Windows Folder DriverStore\FileRepository.
In Windows there are two versions of the NVCUDA dll, the x64 version (nvcuda.dll, 1.9MB) and the x86 version (nvcuda32.dll, 1.4MB). In the Double Driver backup folder there are also both files present (nvcuda.dll and nvcuda32.dll), but they have the same size (1.4MB), it is the x86 version in both files.
