Problem with C:\Users\MyName\Documents backup

I'm running Viata Ultimate SP2
I have a backup batch file with:
robocopy/mir C:usersaMyName\Documents G:\(USB Stick)\..
Was working perfect until i copied the MyPictures from my old XP machine into
the Vista C\users\MyName\Pictures folder
Now the backup robocopy, in addition to copying the documents folder, also
copies the contents of MyPictures to the USB stick
I've tried moving C:\users\MyName\Pictures\MyPictures to a new folder
C:\users\MyName\Pictures\FamilyPics and then deleting the empty
MyPictures folder but it makes no difference.
I must have created some sort of association with the XP MyPictures folder?
How do I reverse this and get back to square one?
Any advice will be appreciated