The problem is most likely not coming from spatie/laravel-backup
package. To run Laravels cronjob you need to a have a central call in your crontab to Laravels scheduler
* * * * * cd /path-to-your-project && php artisan schedule:run
You can also check all the scheduled tasks locally by running
$ php artisan schedule:work
and if they run fine locally then there is an issue with your server, but not with Laravel.
Also always have a look at storage/logs/laravel.log
if there are any errors showing up.
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