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Howard
rsync should do it. by default only updates new/changed files. Presumably there'll be an option to remove deleted files too
https://apple.stackexchange.com/questions/51251/copy-new-files-only-is-this-possible-basically-want-to-merge-two-folders
https://blog.macsales.com/45185-mac-101-learn-the-power-of-rsync-for-backup-remote-archive-systems/