[Bryce Walden]

Take a look at Chronosync from Econ.
https://www.econtechnologies.com/
It will compare any two containers (folders, discs) at a time. You can have both containers update or only one. You could set up an empty container – a file folder – and do one-way synchs into it. Repeat for each original folder you have. You can do trial synchs to see what it will do before committing. You have an option to archive files replaced by newer ones, just in case. I’ve been using this software for years and it has performed very well.