How to run raw SQL query - not select, but insert without any parameters?

Here is the withoutColumn() function in the WarehouseProduct model:

    /**
     * Get all columns of model
     *
     * @return Array
     */
    public static function getTableColumns() {
        $model = new Product();
        return $model->getConnection()
            ->getSchemaBuilder()
            ->getColumnListing($model->getTable());
    }

    /**
     * Return model's columns without given columns
     *
     * @param Array $without_columns
     * @return Array
     */
    public static function withoutColumn(Array $without_columns) {
        return array_diff(self::getTableColumns(), $without_columns);
    }

I have this SQL query what I want to run:

$query = 'INSERT INTO warehouse_product_backups (SELECT ' .
            implode(',', WarehouseProduct::withoutColumn(['id'])) .
            ' FROM warehouse_products)'

As you see here isn't any parameters, I just want to copy datas from one table into another (without id column).

Now I want to do something like this:

DB::insert($query);

Or:

DB::run($query);

This last one said FatalThrowableError: Call to protected method Illuminate\Database\Connection::run() from context 'Illuminate\Database\DatabaseManager'

Any idea?