investbrain/app/Exports/BackupExport.php

<?php

namespace App\Exports;

use App\Exports\Sheets\DailyChangesSheet;
use App\Exports\Sheets\PortfoliosSheet;
use App\Exports\Sheets\TransactionsSheet;
use Maatwebsite\Excel\Concerns\Exportable;
use Maatwebsite\Excel\Concerns\WithMultipleSheets;

class BackupExport implements WithMultipleSheets
{
    use Exportable;

    public function __construct(
        public bool $empty = false
    )
    { }

    /**
     * @return array
     */
    public function sheets(): array
    {
            return [
                new PortfoliosSheet($this->empty),
                new TransactionsSheet($this->empty),
                new DailyChangesSheet($this->empty)
            ];
    }
}