How to keep only the Last 7 days backups?

[takielias]

How to keep only the Last 7 days' backups?
I'm using Laravel 6 & laravel-backup 6. This is My backup config file. Is there anything missing?
`
'defaultStrategy' => [

        /*
         * The number of days for which backups must be kept.
         */
        'keepAllBackupsForDays' => 7,

        /*
         * The number of days for which daily backups must be kept.
         */
        'keepDailyBackupsForDays' => 7,

        /*
         * The number of weeks for which one weekly backup must be kept.
         */
        'keepWeeklyBackupsForWeeks' => 0,

        /*
         * The number of months for which one monthly backup must be kept.
         */
        'keepMonthlyBackupsForMonths' => 0,

        /*
         * The number of years for which one yearly backup must be kept.
         */
        'keepYearlyBackupsForYears' => 0,

        /*
         * After cleaning up the backups remove the oldest backup until
         * this amount of megabytes has been reached.
         */
        'deleteOldestBackupsWhenUsingMoreMegabytesThan' => 5000,
    ],`