'rsync' should be able to do the task. https://askubuntu.com/questions/259772/how-to-merge-folders-and-subfolders
https://www.lifewire.com/copying-directories-with-rsync-3971105 https://unix.stackexchange.com/questions/149965/how-to-copy-merge-two-directories https://invidious.snopyta.org/watch?v=qE77MbDnljA
