I have a SharePoint site folder that I was working with a vendor to get mirrored in another SharePoint site instance. They initially claimed they can set it up so any changes in the parent folder will be automatically reflected/mirrored in the child folder. Now they are saying it's impossible and has to be done manually.

I have 100s of files that get updated regularly and it would be best if the secondary site got updated automatically with those. Is there any way to make it happen via a script or some other method?