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Enter Properties…->LOCAL FILES of the game you want to backup.
And, Click Backup game files… and continue.

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Alert window when backup is completed
Enter Steam->Backup and Restore Games… at the top left.
And, Select Restore a previous backup and click NEXT.

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Click BROWSE… and select the game folder that you backed up.
And, Press NEXT to continue and restore will be completed in a few minutes.

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Alert window when restore is completed