سلام از این قطعه کد برای بکاپ استفاده کن:

public void StartBackupDatabase(string backupName, string backupDescription, string backupFilePath)
        {

            Task.Factory.StartNew(() =>
            {
                if (backupDescription.IsNullOrEmpty()) backupDescription = " ";
                _Exception = null;
                if (Thread.CurrentThread.Name.IsNullOrEmpty()) { Thread.CurrentThread.Name = "SQL Backup"; }
                using (SqlConnection con = new SqlConnection(this.MasterConnectionString))
                {
                    //The FireInfoMessageEventOnUserErrors property and InfoMessage event ensure that the C# code captures these messages during execution rather than only at the end.
                    con.FireInfoMessageEventOnUserErrors = true;
                    con.InfoMessage += OnInfoMessage;
                    con.Open();
                    //The stats = 1 clause tells SQL Server to emit severity 0 messages at the specified percentage interval (in this case 1%).
                    using (var cmd = new SqlCommand("BACKUP DATABASE @database TO DISK = @filename with FORMAT,description = @description, name = @name, stats = 1", con))
                    {

                        cmd.Parameters.Clear();
                        cmd.Parameters.AddWithValue("@database", Database);
                        cmd.Parameters.AddWithValue("@filename", backupFilePath);
                        cmd.Parameters.AddWithValue("@description", backupDescription);
                        cmd.Parameters.AddWithValue("@name", backupName);

                        cmd.CommandTimeout = (int)TimeSpan.FromMinutes(10).TotalSeconds;
                        cmd.ExecuteNonQuery();
                        isBackupCompleted = true;
                    }

                    con.Close();
                    con.InfoMessage -= OnInfoMessage;
                    con.FireInfoMessageEventOnUserErrors = false;
                }

            }).ContinueWith(task =>
            {
                if (task.Exception != null)
                {
                    OnCompleted(task.Exception);
                    isBackupCompleted = false;
                }
                else if (!_Exception.IsNullOrEmpty())
                {
                    OnCompleted(new Exception(_Exception));
                    isBackupCompleted = false;
                }
                else
                {
                    OnCompleted(null);
                    isBackupCompleted = true;
                }
            });
        }

private void OnInfoMessage(object sender, SqlInfoMessageEventArgs e)
        {
            foreach (SqlError info in e.Errors)
            {
                if (info.Class > 10)
                {
                    _Exception += "\r\n" + info.Message;
                    _Exception = _Exception.Trim();
                    // TODO: treat this as a genuine error
                }
                else
                {
                    string numValue = info.Message.Split(" ".ToCharArray()).First();
                    int progressPercent;
                    if (int.TryParse(numValue, out progressPercent))
                    {
                        OnProgressChanged(progressPercent);
                    }
                    // TODO: treat this as a progress message
                }
            }
        }

private string _Exception;
        protected virtual void OnProgressChanged(int percent)
        {
            if (ProgressChanged != null)
            {
                ProgressChanged(this, new System.ComponentModel.ProgressChangedEventArgs(percent, null));
            }
        }
        public event ActionCompletedEventHandler ActionCompleted;

        public event System.ComponentModel.ProgressChangedEventHandler ProgressChanged;