Copy a file from the server to a local folder

I'm developing a routine for the purpose of copying files from the server to a local folder, but unfortunately it does not copy. The idea is that there are every minute the files are copied.

I left a Sleep(5000) less to facilitate the test. There is no domain on the server and the folder on the server is mapped. Could you take a look?

Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;

namespace WindowsService1
{
    public partial class Service1 : ServiceBase
    {
        public Service1()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            ThreadStart start = new ThreadStart(CopiarArquivo);

            Thread thread = new Thread(start);

            thread.Start();
        }

        protected override void OnStop()
        {
        }

        public void CopiarArquivo()
        {

            for (int i = 0; i < 600; i++)
            {
                Thread.Sleep(5000);

            File.Copy(@"Z:\PARAM.SAC", @"C:\SACTRM\PARAM.SAC");
            }
        }
    }
}