File::copy() 

\nn\t3::File()->copy($src = NULL, $dest = NULL, $renameIfFileExists = true); 

Copies a file. Returns false if the file could not be copied. Returns (new) file name if copying was successful.

$filename = \nn\t3::File()->copy('fileadmin/image.jpg', 'fileadmin/image-copy.jpg');
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@param string $src Path to the source file
@param string $dest Path to the destination file
@param boolean $renameIfFileExists Rename file if a file with the same name already exists at the destination location
@return string|boolean

Source Code 

public function copy($src = null, $dest = null, $renameIfFileExists = true)
{
	if (!file_exists($src)) return false;
	if (!$renameIfFileExists && $this->exists($dest)) return false;
	$dest = $this->uniqueFilename($dest);
	$path = pathinfo($dest, PATHINFO_DIRNAME) . '/';
	// Ordner anlegen, falls noch nicht vorhanden
	\nn\t3::Storage()->getFolder($path);
	\TYPO3\CMS\Core\Utility\GeneralUtility::upload_copy_move($src, $dest);
	return $this->exists($dest) ? $dest : false;
}
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