How to merge many folders into one?

Question

ubuntu

Made a lot of backup copies of several folders in different folders.
It is necessary to merge them into one, while maintaining the recursive structure, so that files with the same name, but different content, are not overwritten.
If the files have the same name and content, then they are overwritten (Only one will remain.).

Answer 1

cp without overwrite
how to copy with recursion find yourself in man?
although they say rsync is better.