Robocopy: How do I copy files that do not exist in the destination, but copy them into a directory other than the destination?

Question

Let's say my destination directory already contains some files. My source directory contains identical files PLUS some extra files that are not in the destination and I want to copy these extra files. I know I can:

robocopy c:\source_path c:\destination_path /e /xc /xn /xo

However, I want to copy the these files into a different directory from the destination. In other word, I want to keep these files that are not in the destination separate from the files already in the destination.

How do I do that? I am using Windows 10 if that matters.

EDIT 2020/4/2:

harrymc's answer didn't quite work.

powershell "Get-ChildItem -Path 'c:\source_path` -exclude (Get-ChildItem -Path `c:\exclusion_path`) | Copy-Item -Destination 'c:\destination_path'"

This only copies files directly under the \source_path and ignore all subdirectories (My bad - I didn't mention anything about subdirectory).

When I include option -Recurse as in:

powershell "Get-ChildItem -Path 'c:\source_path` -exclude (Get-ChildItem -Path `c:\exclusion_path`) -Recurse | Copy-Item -Destination 'c:\destination_path'"

it places all subdirectories (in all levels) under \destination_path as EMPTY folders, and place all files (in all subdirectories) directly under \destination_path, overwriting any files if there are multiple files with the same name in separate directories in \source_path. PLUS, no files or directories in \exclusion_path were excluded (\source_path and \exclusion_path have the same directory structure). I don't understand how this is supposed to work.

Answer 1

Robocopy is not the right tool for this job. PowerShell is much better, where this can be done with a one-liner.

Assuming copying from c:\source_path to c:\destination_path but excluding all in c:\exclusion_path:

Get-ChildItem -Path 'c:\source_path` -exclude (Get-ChildItem -Path `c:\exclusion_path`) | Copy-Item -Destination 'c:\destination_path'

To make it work from CMD, write it like this:

powershell "Get-ChildItem -Path 'c:\source_path` -exclude (Get-ChildItem -Path `c:\exclusion_path`) | Copy-Item -Destination 'c:\destination_path'"