Folder Copy Skipping Similar Files

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C#

I am seeing a lot of examples of folder recursively getting copied and an option to check whether to overwrite existing files (y/n).

However, I am unable top locate any such code which checks for existing files and overwrites only if :

a. Delete files + folders if not present in the source directory
b. if the file sizes are not similar
c. if the date of the two files vary

Is this present across the globe anywhere ?

Thanks if you can guide me there.