FILE

void backUp(PAYROLL employee[], long int *pCounter)
{
    FILE *counter;
        errno_t result1 = fopen_s(&counter, "c:\\myFiles\\counter.bin", "a+b");
        if (result1 == 0){
            fwrite(pCounter, sizeof(long int), 1, counter);
            fclose(counter);
        }
        else
            printf("Back up of counter failed! error:%d",result1);

    FILE *record;

        errno_t result2 = fopen_s(&record, "c:\\myFiles\\record.bin", "a+b");
        if (result2 == 0){
            fwrite(employee, *pCounter *sizeof(PAYROLL), 1, record);
            fclose(record);
        }

        else
            printf("Back up of record failed! error:%d", result2);
}