You can create your own custom health check by letting a class extend Spatie\Backup\Tasks\Monitor\HealthCheck.
That base class contains one abstract method that you should implement.
public function checkHealth(BackupDestination $backupDestination);
If your check determines that the backup is not healthy it should throw a Spatie\Backup\Exceptions\InvalidHealthCheck exception. The HealthCheck base class contains three helpful methods that helps you do this.
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fail($message): will throw the right exception under the hood.
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failIf(bool $condition, string $message): will throw the right exception if $condition is true
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failUnless(bool $condition, string $message): will throw the right exception if $condition is false
You should register your custom health check in the health_checks key of the backup.php config file.
To see an example of a HealthCheck, go read the could of the MaximumAgeInDays and MaximumStorageInMegabytes health checks that are provided by the package.