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On Linux, there is a bash command to copy files, and if the file is already in the destination, to take the newer one based on its timestamp.

cp -u source destination

The description of this option is:

-u, --update - Copy only when the source file is newer than the destination file or when the destination file is missing.

Is there such a command for Windows Command Prompt as well? Or can I achieve the same result via other relatively simple means (for free)?

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Use robocopy with the /XO flag to exclude copying older files.

If you're copying to another machine then you may also wish to use /FFT which introduces a tolerance of ± 2 seconds.

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