RoboCopy and Buffalo TeraStation

Recently I set up a new recurring backup scheme from my PC’s main data drive to a 1TB Buffalo TeraStation II Pro NAS device but ran into a strange problem. I was planning to use RoboCopy as an easy and cheap (read: free) solution to a recurring backup. However, I was baffled by RoboCopy’s insistence on copying some files despite options instructing it to only copy changed files. No matter what I did, RoboCopy would always re-copy some files.
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