The transaction log for database 'Database' is full due to 'LOG_BACKUP'.

If you are truncating the transaction logs, this means you are breaking the T-Log LSN (Log Sequence Numbers). This follows that if disaster comes, you would not be able to restore your T-Logs and there would be no option for you to do point in time recovery. If you are fine with this situation and there is nothing to worry, I suggest that you change your recovery model to Simple Recovery Model. This way, you will not have extra ordinary growth of your log file.