diff --git a/engine/executor/dm/api_test.go b/engine/executor/dm/api_test.go
index 5e0710dc274..9a6c20224a8 100644
--- a/engine/executor/dm/api_test.go
+++ b/engine/executor/dm/api_test.go
@@ -20,10 +20,11 @@ import (
 	"testing"
 
 	"github.com/gogo/protobuf/jsonpb"
-	"github.com/pingcap/tiflow/dm/config"
+	dmconfig "github.com/pingcap/tiflow/dm/config"
 	"github.com/pingcap/tiflow/dm/pb"
 	"github.com/pingcap/tiflow/engine/framework"
 	frameModel "github.com/pingcap/tiflow/engine/framework/model"
+	"github.com/pingcap/tiflow/engine/jobmaster/dm/config"
 	"github.com/pingcap/tiflow/engine/jobmaster/dm/metadata"
 	dcontext "github.com/pingcap/tiflow/engine/pkg/context"
 	"github.com/pingcap/tiflow/engine/pkg/deps"
@@ -102,6 +103,22 @@ func TestQueryStatusAPI(t *testing.T) {
 			Result: &dmpkg.ProcessResult{Errors: []*dmpkg.ProcessError{processError}},
 			Status: []byte(syncStatusBytes),
 		}
+		taskCfg = &config.TaskCfg{
+			JobCfg: config.JobCfg{
+				TargetDB: &dmconfig.DBConfig{},
+				Upstreams: []*config.UpstreamCfg{
+					{
+						MySQLInstance: dmconfig.MySQLInstance{
+							Mydumper: &dmconfig.MydumperConfig{},
+							Loader:   &dmconfig.LoaderConfig{},
+							Syncer:   &dmconfig.SyncerConfig{},
+							SourceID: "task-id",
+						},
+						DBCfg: &dmconfig.DBConfig{},
+					},
+				},
+			},
+		}
 	)
 
 	dctx := dcontext.Background()
@@ -111,7 +128,7 @@ func TestQueryStatusAPI(t *testing.T) {
 	}))
 	dctx = dctx.WithDeps(dp)
 
-	dmWorker := newDMWorker(dctx, "", frameModel.WorkerDMDump, &config.SubTaskConfig{SourceID: "task-id"}, 0)
+	dmWorker := newDMWorker(dctx, "", frameModel.WorkerDMDump, taskCfg)
 	unitHolder := &mockUnitHolder{}
 	dmWorker.unitHolder = unitHolder
 
@@ -148,7 +165,23 @@ func TestStopWorker(t *testing.T) {
 	}))
 	dctx = dctx.WithDeps(dp)
 
-	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, &config.SubTaskConfig{SourceID: "task-id"}, 0)
+	taskCfg := &config.TaskCfg{
+		JobCfg: config.JobCfg{
+			TargetDB: &dmconfig.DBConfig{},
+			Upstreams: []*config.UpstreamCfg{
+				{
+					MySQLInstance: dmconfig.MySQLInstance{
+						Mydumper: &dmconfig.MydumperConfig{},
+						Loader:   &dmconfig.LoaderConfig{},
+						Syncer:   &dmconfig.SyncerConfig{},
+						SourceID: "task-id",
+					},
+					DBCfg: &dmconfig.DBConfig{},
+				},
+			},
+		},
+	}
+	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, taskCfg)
 	dmWorker.BaseWorker = framework.MockBaseWorker("worker-id", "master-id", dmWorker)
 	dmWorker.BaseWorker.Init(context.Background())
 	dmWorker.unitHolder = &mockUnitHolder{}
@@ -169,7 +202,23 @@ func TestOperateTask(t *testing.T) {
 	}))
 	dctx = dctx.WithDeps(dp)
 
-	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, &config.SubTaskConfig{SourceID: "task-id"}, 0)
+	taskCfg := &config.TaskCfg{
+		JobCfg: config.JobCfg{
+			TargetDB: &dmconfig.DBConfig{},
+			Upstreams: []*config.UpstreamCfg{
+				{
+					MySQLInstance: dmconfig.MySQLInstance{
+						Mydumper: &dmconfig.MydumperConfig{},
+						Loader:   &dmconfig.LoaderConfig{},
+						Syncer:   &dmconfig.SyncerConfig{},
+						SourceID: "task-id",
+					},
+					DBCfg: &dmconfig.DBConfig{},
+				},
+			},
+		},
+	}
+	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, taskCfg)
 	dmWorker.BaseWorker = framework.MockBaseWorker("worker-id", "master-id", dmWorker)
 	dmWorker.BaseWorker.Init(context.Background())
 	mockUnitHolder := &mockUnitHolder{}
diff --git a/engine/executor/dm/worker.go b/engine/executor/dm/worker.go
index e3f7013599c..7ad2d5b0901 100644
--- a/engine/executor/dm/worker.go
+++ b/engine/executor/dm/worker.go
@@ -73,9 +73,8 @@ func (f workerFactory) DeserializeConfig(configBytes []byte) (registry.WorkerCon
 // NewWorkerImpl implements WorkerFactory.NewWorkerImpl
 func (f workerFactory) NewWorkerImpl(ctx *dcontext.Context, workerID frameModel.WorkerID, masterID frameModel.MasterID, conf framework.WorkerConfig) (framework.WorkerImpl, error) {
 	cfg := conf.(*config.TaskCfg)
-	log.Info("new dm worker", zap.String(logutil.ConstFieldJobKey, masterID), zap.String(logutil.ConstFieldWorkerKey, workerID), zap.Uint64("config_modify_revision", cfg.ModRevision))
-	dmSubtaskCfg := cfg.ToDMSubTaskCfg(masterID)
-	return newDMWorker(ctx, masterID, f.workerType, dmSubtaskCfg, cfg.ModRevision), nil
+	log.Info("new dm worker", zap.String(logutil.ConstFieldJobKey, masterID), zap.Stringer("worker_type", f.workerType), zap.String(logutil.ConstFieldWorkerKey, workerID), zap.Any("task_config", cfg))
+	return newDMWorker(ctx, masterID, f.workerType, cfg), nil
 }
 
 // IsRetryableError implements WorkerFactory.IsRetryableError
@@ -101,22 +100,25 @@ type dmWorker struct {
 	messageHandlerManager p2p.MessageHandlerManager
 
 	cfgModRevision uint64
+	needExtStorage bool
 }
 
-func newDMWorker(ctx *dcontext.Context, masterID frameModel.MasterID, workerType framework.WorkerType, cfg *dmconfig.SubTaskConfig, cfgModRevision uint64) *dmWorker {
+func newDMWorker(ctx *dcontext.Context, masterID frameModel.MasterID, workerType framework.WorkerType, cfg *config.TaskCfg) *dmWorker {
 	// TODO: support config later
 	// nolint:errcheck
 	bf, _ := backoff.NewBackoff(dmconfig.DefaultBackoffFactor, dmconfig.DefaultBackoffJitter, dmconfig.DefaultBackoffMin, dmconfig.DefaultBackoffMax)
 	autoResume := &worker.AutoResumeInfo{Backoff: bf, LatestPausedTime: time.Now(), LatestResumeTime: time.Now()}
+	dmSubtaskCfg := cfg.ToDMSubTaskCfg(masterID)
 	w := &dmWorker{
-		cfg:            cfg,
+		cfg:            dmSubtaskCfg,
 		stage:          metadata.StageInit,
 		workerType:     workerType,
-		taskID:         cfg.SourceID,
+		taskID:         dmSubtaskCfg.SourceID,
 		masterID:       masterID,
-		unitHolder:     newUnitHolderImpl(workerType, cfg),
+		unitHolder:     newUnitHolderImpl(workerType, dmSubtaskCfg),
 		autoResume:     autoResume,
-		cfgModRevision: cfgModRevision,
+		cfgModRevision: cfg.ModRevision,
+		needExtStorage: cfg.NeedExtStorage,
 	}
 
 	// nolint:errcheck
@@ -135,7 +137,7 @@ func (w *dmWorker) InitImpl(ctx context.Context) error {
 	if err := w.messageAgent.UpdateClient(w.masterID, w); err != nil {
 		return err
 	}
-	if w.cfg.Mode != dmconfig.ModeIncrement {
+	if w.cfg.Mode != dmconfig.ModeIncrement && w.needExtStorage {
 		if err := w.setupStorage(ctx); err != nil {
 			return err
 		}
diff --git a/engine/executor/dm/worker_test.go b/engine/executor/dm/worker_test.go
index 38c88b860d3..825ac72b6d7 100644
--- a/engine/executor/dm/worker_test.go
+++ b/engine/executor/dm/worker_test.go
@@ -110,7 +110,24 @@ func TestWorker(t *testing.T) {
 	require.NoError(t, dp.Provide(func() p2p.MessageHandlerManager {
 		return p2p.NewMockMessageHandlerManager()
 	}))
-	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, &dmconfig.SubTaskConfig{}, 0)
+	taskCfg := &config.TaskCfg{
+		JobCfg: config.JobCfg{
+			TargetDB: &dmconfig.DBConfig{},
+			Upstreams: []*config.UpstreamCfg{
+				{
+					MySQLInstance: dmconfig.MySQLInstance{
+						Mydumper: &dmconfig.MydumperConfig{},
+						Loader:   &dmconfig.LoaderConfig{},
+						Syncer:   &dmconfig.SyncerConfig{},
+						SourceID: "task-id",
+					},
+					DBCfg: &dmconfig.DBConfig{},
+				},
+			},
+		},
+		NeedExtStorage: true,
+	}
+	dmWorker := newDMWorker(dctx, "master-id", frameModel.WorkerDMDump, taskCfg)
 	unitHolder := &mockUnitHolder{}
 	dmWorker.unitHolder = unitHolder
 	dmWorker.BaseWorker = framework.MockBaseWorker("worker-id", "master-id", dmWorker)
diff --git a/engine/jobmaster/dm/api_test.go b/engine/jobmaster/dm/api_test.go
index 64999964723..8fbacdcecf2 100644
--- a/engine/jobmaster/dm/api_test.go
+++ b/engine/jobmaster/dm/api_test.go
@@ -47,15 +47,17 @@ func TestQueryStatusAPI(t *testing.T) {
 			BaseJobMaster: mockBaseJobmaster,
 			metadata:      metadata.NewMetaData(metaKVClient, log.L()),
 		}
-		job = &metadata.Job{
+		jobCfg  = &config.JobCfg{ModRevision: 4}
+		taskCfg = jobCfg.ToTaskCfg()
+		job     = &metadata.Job{
 			Tasks: map[string]*metadata.Task{
-				"task1": {Stage: metadata.StagePaused, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task2": {Stage: metadata.StageFinished, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task3": {Stage: metadata.StageFinished, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task4": {Stage: metadata.StageRunning, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task5": {Stage: metadata.StageRunning, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task6": {Stage: metadata.StageRunning, Cfg: &config.TaskCfg{ModRevision: 4}},
-				"task7": {Stage: metadata.StageFinished, Cfg: &config.TaskCfg{ModRevision: 4}},
+				"task1": {Stage: metadata.StagePaused, Cfg: taskCfg},
+				"task2": {Stage: metadata.StageFinished, Cfg: taskCfg},
+				"task3": {Stage: metadata.StageFinished, Cfg: taskCfg},
+				"task4": {Stage: metadata.StageRunning, Cfg: taskCfg},
+				"task5": {Stage: metadata.StageRunning, Cfg: taskCfg},
+				"task6": {Stage: metadata.StageRunning, Cfg: taskCfg},
+				"task7": {Stage: metadata.StageFinished, Cfg: taskCfg},
 			},
 		}
 		dumpStatus = &pb.DumpStatus{
diff --git a/engine/jobmaster/dm/checkpoint/agent.go b/engine/jobmaster/dm/checkpoint/agent.go
index 144f8ce9596..5fa66250acf 100644
--- a/engine/jobmaster/dm/checkpoint/agent.go
+++ b/engine/jobmaster/dm/checkpoint/agent.go
@@ -211,7 +211,7 @@ func onlineDDLName(jobID string, cfg *config.JobCfg) string {
 
 func isLoadFresh(ctx context.Context, jobID string, taskCfg *config.TaskCfg, db *conn.BaseDB) (bool, error) {
 	// nolint:gosec
-	query := fmt.Sprintf("SELECT status FROM %s WHERE `task_name` = ? AND `source_name` = ?", loadTableName(jobID, (*config.JobCfg)(taskCfg)))
+	query := fmt.Sprintf("SELECT status FROM %s WHERE `task_name` = ? AND `source_name` = ?", loadTableName(jobID, taskCfg.ToJobCfg()))
 	var status string
 	err := db.DB.QueryRowContext(ctx, query, jobID, taskCfg.Upstreams[0].SourceID).Scan(&status)
 	switch {
@@ -226,7 +226,7 @@ func isLoadFresh(ctx context.Context, jobID string, taskCfg *config.TaskCfg, db
 
 func isSyncFresh(ctx context.Context, jobID string, taskCfg *config.TaskCfg, db *conn.BaseDB) (bool, error) {
 	// nolint:gosec
-	query := fmt.Sprintf("SELECT 1 FROM %s WHERE `id` = ? AND `is_global` = true", syncTableName(jobID, (*config.JobCfg)(taskCfg)))
+	query := fmt.Sprintf("SELECT 1 FROM %s WHERE `id` = ? AND `is_global` = true", syncTableName(jobID, taskCfg.ToJobCfg()))
 	var status string
 	err := db.DB.QueryRowContext(ctx, query, taskCfg.Upstreams[0].SourceID).Scan(&status)
 	switch {
diff --git a/engine/jobmaster/dm/config/config.go b/engine/jobmaster/dm/config/config.go
index a8a46dca1ec..6df83ea8fc3 100644
--- a/engine/jobmaster/dm/config/config.go
+++ b/engine/jobmaster/dm/config/config.go
@@ -161,9 +161,7 @@ func (c *JobCfg) Clone() (*JobCfg, error) {
 func (c *JobCfg) ToTaskCfgs() map[string]*TaskCfg {
 	taskCfgs := make(map[string]*TaskCfg, len(c.Upstreams))
 	for _, mysqlInstance := range c.Upstreams {
-		// nolint:errcheck
-		jobCfg, _ := c.Clone()
-		taskCfg := (*TaskCfg)(jobCfg)
+		taskCfg := c.ToTaskCfg()
 		taskCfg.Upstreams = []*UpstreamCfg{mysqlInstance}
 		taskCfgs[mysqlInstance.SourceID] = taskCfg
 	}
@@ -176,7 +174,7 @@ func FromTaskCfgs(taskCfgs []*TaskCfg) *JobCfg {
 		return nil
 	}
 
-	jobCfg := (*JobCfg)(taskCfgs[0])
+	jobCfg := taskCfgs[0].ToJobCfg()
 	// nolint:errcheck
 	jobCfg, _ = jobCfg.Clone()
 	for i := 1; i < len(taskCfgs); i++ {
@@ -248,9 +246,31 @@ func (c *JobCfg) verifySourceID() error {
 	return nil
 }
 
+// ToTaskCfg converts JobCfg to TaskCfg.
+func (c *JobCfg) ToTaskCfg() *TaskCfg {
+	// nolint:errcheck
+	clone, _ := c.Clone()
+	return &TaskCfg{
+		JobCfg: *clone,
+	}
+}
+
 // TaskCfg shares same struct as JobCfg, but it only serves one upstream.
 // TaskCfg can be converted to an equivalent DM subtask by ToDMSubTaskCfg.
-type TaskCfg JobCfg
+// TaskCfg add some internal config for jobmaster/worker.
+type TaskCfg struct {
+	JobCfg
+
+	// FIXME: remove this item after fix https://github.com/pingcap/tiflow/issues/7304
+	NeedExtStorage bool
+}
+
+// ToJobCfg converts TaskCfg to JobCfg.
+func (c *TaskCfg) ToJobCfg() *JobCfg {
+	// nolint:errcheck
+	clone, _ := c.JobCfg.Clone()
+	return clone
+}
 
 // ToDMSubTaskCfg adapts a TaskCfg to a SubTaskCfg for worker now.
 // TODO: fully support all fields
diff --git a/engine/jobmaster/dm/dm_jobmaster.go b/engine/jobmaster/dm/dm_jobmaster.go
index 004327433da..ae7cafbef4e 100644
--- a/engine/jobmaster/dm/dm_jobmaster.go
+++ b/engine/jobmaster/dm/dm_jobmaster.go
@@ -411,7 +411,7 @@ func (jm *JobMaster) removeCheckpoint(ctx context.Context) error {
 	}
 	job := state.(*metadata.Job)
 	for _, task := range job.Tasks {
-		cfg := (*config.JobCfg)(task.Cfg)
+		cfg := task.Cfg.ToJobCfg()
 		return jm.checkpointAgent.Remove(ctx, cfg)
 	}
 	return errors.New("no task found in job")
diff --git a/engine/jobmaster/dm/worker_manager.go b/engine/jobmaster/dm/worker_manager.go
index f1c8a9acc21..c8b350b9c4c 100644
--- a/engine/jobmaster/dm/worker_manager.go
+++ b/engine/jobmaster/dm/worker_manager.go
@@ -249,6 +249,7 @@ func (wm *WorkerManager) checkAndScheduleWorkers(ctx context.Context, job *metad
 		}
 
 		var resources []resModel.ResourceID
+		taskCfg := persistentTask.Cfg
 		// first worker don't need local resource.
 		// unfresh sync unit don't need local resource.(if we need to save table checkpoint for loadTableStructureFromDump in future, we can save it before saving global checkpoint.)
 		// TODO: storage should be created/discarded in jobmaster instead of worker.
@@ -256,8 +257,13 @@ func (wm *WorkerManager) checkAndScheduleWorkers(ctx context.Context, job *metad
 			resources = append(resources, NewDMResourceID(wm.jobID, persistentTask.Cfg.Upstreams[0].SourceID))
 		}
 
+		// FIXME: remove this after fix https://github.com/pingcap/tiflow/issues/7304
+		if nextUnit != frameModel.WorkerDMSync || isFresh {
+			taskCfg.NeedExtStorage = true
+		}
+
 		// createWorker should be an asynchronous operation
-		if err := wm.createWorker(ctx, taskID, nextUnit, persistentTask.Cfg, resources...); err != nil {
+		if err := wm.createWorker(ctx, taskID, nextUnit, taskCfg, resources...); err != nil {
 			recordError = err
 			continue
 		}
diff --git a/engine/jobmaster/dm/worker_manager_test.go b/engine/jobmaster/dm/worker_manager_test.go
index ab8f598b9ed..45fc59cd1de 100644
--- a/engine/jobmaster/dm/worker_manager_test.go
+++ b/engine/jobmaster/dm/worker_manager_test.go
@@ -157,10 +157,12 @@ func (t *testDMJobmasterSuite) TestClearWorkerStatus() {
 	job.Tasks[source2] = metadata.NewTask(&config.TaskCfg{})
 	require.NoError(t.T(), workerManager.stopOutdatedWorkers(context.Background(), job))
 	messageAgent.On("SendMessage").Return(destroyError).Once()
-	job.Tasks[source2] = metadata.NewTask(&config.TaskCfg{ModRevision: 1})
+	jobCfg := &config.JobCfg{ModRevision: 1}
+	taskCfg := jobCfg.ToTaskCfg()
+	job.Tasks[source2] = metadata.NewTask(taskCfg)
 	require.EqualError(t.T(), workerManager.stopOutdatedWorkers(context.Background(), job), destroyError.Error())
 	messageAgent.On("SendMessage").Return(nil).Once()
-	job.Tasks[source2] = metadata.NewTask(&config.TaskCfg{ModRevision: 1})
+	job.Tasks[source2] = metadata.NewTask(taskCfg)
 	require.NoError(t.T(), workerManager.stopOutdatedWorkers(context.Background(), job))
 
 	job = metadata.NewJob(&config.JobCfg{})