File::copyTo

public function copyTo(Folder $targetFolder, $updatedBy, $generateUniqueName = false)
{
	$this->errorCollection->clear();

	$forkFileId = CFile::CloneFile($this->getFileId());
	if (!$forkFileId)
	{
		$this->errorCollection->add(array(new Error(Loc::getMessage('DISK_FILE_MODEL_ERROR_COULD_NOT_COPY_FILE'), self::ERROR_COULD_NOT_COPY_FILE)));
		return null;
	}

	$fileModel = $targetFolder->addFile([
		'NAME' => $this->getName(),
		'FILE_ID' => $forkFileId,
		'ETAG' => $this->getEtag(),
		'SIZE' => $this->getSize(),
		'CREATED_BY' => $updatedBy,
	], [], $generateUniqueName);
	if (!$fileModel)
	{
		CFile::Delete($forkFileId);
		$this->errorCollection->add($targetFolder->getErrors());

		return null;
	}

	return $fileModel;
}