As duplicate file names are not permissable within the same directory, the answer has to be no. Depending on what you are trying to achieve, there are other possibilities.
- You could copy the contents of one directory to another, and this is most likely easiest to achieve and automate via a good old DOS Batch file, such as "copy c:\folder1\*.* c:\folder2*.*"
- This can be time consuming, especially if the folder is large and worse still if most files don't change. Far better to use an archive / compression program. I used to use ARJ to do something like this; but I used the relevent switches to update the archive with changed and / or new files. If you opt for this route, make sure you use a really good utility. I found ARJ to be rock solid and achieved really good compression ratios, and of course it is really fast. Write a .BAT file, put a short cut to your desktop and away you go.
One thing though, I would not feel safe with putting any form of backup or copy on the same drive, let alone in the same directory. Like I said, depends on what you wanna do it for.