fix create backup

pkg/compute/models/guests.go

@@ -1400,6 +1400,11 @@ func (self *SGuest) GetExtraDetails(ctx context.Context, userCred mcclient.Token
 	}
 	extra.Add(isGpu, "is_gpu")
 
+	if len(self.BackupHostId) > 0 {
+		backupHost := HostManager.FetchHostById(self.BackupHostId)
+		extra.Set("backup_host_name", jsonutils.NewString(backupHost.Name))
+	}
+
 	if self.IsPrepaidRecycle() {
 		extra.Add(jsonutils.JSONTrue, "is_prepaid_recycle")
 	} else {

pkg/compute/tasks/guest_backup_tasks.go

@@ -231,7 +231,7 @@ func (self *GuestCreateBackupTask) OnGuestStart(ctx context.Context, guest *mode
 	self.SetStage("OnSyncToBackup", nil)
 	err := guest.GuestStartAndSyncToBackup(ctx, self.UserCred, nil, self.GetTaskId())
 	if err != nil {
-		self.SetStageFailed(ctx, fmt.Sprintf("Guest sycn to backup error %s", err.Error()))
+		self.TaskFailed(ctx, guest, fmt.Sprintf("Guest sycn to backup error %s", err.Error()))
 	}
 }