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I have an External HDD for my game backups, but every time there's an update I have to move the entire game folder again and choose "Replace all files".

Is there a way I can only copy the changed/updated files to the backup drive?

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You can use robocopy from the command line with the /XO and /MIR options, it will mirror a directory and skip older files.

For example:

robocopy /mir /zb /xo /copyall C:\MyGames\GameA B:\Backups\GameA

See the documentation for more info.

If copying to/from a network share, add the /FFT option.

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