Need Help. How I can set one way sync with few folders.

What I like to make: copy not all HDD but a few folders to external HDD for one sync, but program writes that is impossible (one way sync with few folders).
Any ideas how I can make it?
What I images is like this - I connect my external HDD to computer, run comodo backup, program should sync source folders and back up folders and if there is new files in source should them copy to back up.
Any help appreciate.

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