public void ScheduleBackupTasks(BackupSchedulerService backupSchedulerService)
        {
            Log.DebugFormat("started to schedule backups");
            var backupsToSchedule = BackupRepository.GetBackupSchedules().Where(schedule => Schedule.IsToBeProcessed(schedule)).ToList();

            Log.DebugFormat("{0} backups are to schedule", backupsToSchedule.Count);
            foreach (var schedule in backupsToSchedule)
            {
                if (!backupSchedulerService.IsStarted)
                {
                    return;
                }
                try
                {
                    var tariff = PaymentManager.GetTariff(schedule.TenantId);
                    if (tariff.State < TariffState.Delay)
                    {
                        schedule.LastBackupTime = DateTime.UtcNow;
                        BackupRepository.SaveBackupSchedule(schedule);
                        Log.DebugFormat("Start scheduled backup: {0}, {1}, {2}, {3}", schedule.TenantId, schedule.BackupMail, schedule.StorageType, schedule.StorageBasePath);
                        BackupWorker.StartScheduledBackup(schedule);
                    }
                    else
                    {
                        Log.DebugFormat("Skip portal {0} not paid", schedule.TenantId);
                    }
                }
                catch (Exception error)
                {
                    Log.Error("error while scheduling backups: {0}", error);
                }
            }
        }