diff --git a/weed/worker/tasks/ec_vacuum/ec_vacuum_task.go b/weed/worker/tasks/ec_vacuum/ec_vacuum_task.go
index 2451dc0e5..6266e2b46 100644
--- a/weed/worker/tasks/ec_vacuum/ec_vacuum_task.go
+++ b/weed/worker/tasks/ec_vacuum/ec_vacuum_task.go
@@ -20,29 +20,35 @@ import (
 // EcVacuumTask represents an EC vacuum task that collects, decodes, and re-encodes EC volumes
 type EcVacuumTask struct {
 	*base.BaseTask
-	volumeID       uint32
-	collection     string
-	sourceNodes    map[pb.ServerAddress]erasure_coding.ShardBits
-	tempDir        string
-	grpcDialOption grpc.DialOption
+	volumeID         uint32
+	collection       string
+	sourceNodes      map[pb.ServerAddress]erasure_coding.ShardBits
+	sourceGeneration uint32 // generation to vacuum from (G)
+	targetGeneration uint32 // generation to create (G+1)
+	tempDir          string
+	grpcDialOption   grpc.DialOption
 }
 
 // NewEcVacuumTask creates a new EC vacuum task instance
-func NewEcVacuumTask(id string, volumeID uint32, collection string, sourceNodes map[pb.ServerAddress]erasure_coding.ShardBits) *EcVacuumTask {
+func NewEcVacuumTask(id string, volumeID uint32, collection string, sourceNodes map[pb.ServerAddress]erasure_coding.ShardBits, sourceGeneration uint32) *EcVacuumTask {
 	return &EcVacuumTask{
-		BaseTask:    base.NewBaseTask(id, types.TaskType("ec_vacuum")),
-		volumeID:    volumeID,
-		collection:  collection,
-		sourceNodes: sourceNodes,
+		BaseTask:         base.NewBaseTask(id, types.TaskType("ec_vacuum")),
+		volumeID:         volumeID,
+		collection:       collection,
+		sourceNodes:      sourceNodes,
+		sourceGeneration: sourceGeneration,     // generation to vacuum from (G)
+		targetGeneration: sourceGeneration + 1, // generation to create (G+1)
 	}
 }
 
 // Execute performs the EC vacuum operation
 func (t *EcVacuumTask) Execute(ctx context.Context, params *worker_pb.TaskParams) error {
 	t.LogInfo("Starting EC vacuum task", map[string]interface{}{
-		"volume_id":   t.volumeID,
-		"collection":  t.collection,
-		"shard_nodes": len(t.sourceNodes),
+		"volume_id":         t.volumeID,
+		"collection":        t.collection,
+		"source_generation": t.sourceGeneration,
+		"target_generation": t.targetGeneration,
+		"shard_nodes":       len(t.sourceNodes),
 	})
 
 	// Step 1: Create temporary working directory
@@ -150,7 +156,7 @@ func (t *EcVacuumTask) collectEcShardsToWorker() (pb.ServerAddress, error) {
 				CopyEcjFile:    true,
 				CopyVifFile:    true,
 				SourceDataNode: string(sourceNode),
-				Generation:     1, // TODO: implement proper generation tracking in vacuum task
+				Generation:     t.targetGeneration, // copy new EC shards as G+1
 			})
 			if copyErr != nil {
 				return fmt.Errorf("failed to copy shards %v from %s to %s: %w", needToCopyBits.ShardIds(), sourceNode, targetNode, copyErr)
@@ -206,7 +212,7 @@ func (t *EcVacuumTask) encodeVolumeToEcShards(targetNode pb.ServerAddress) error
 		_, err := client.VolumeEcShardsGenerate(context.Background(), &volume_server_pb.VolumeEcShardsGenerateRequest{
 			VolumeId:   t.volumeID,
 			Collection: t.collection,
-			Generation: 1, // TODO: implement proper generation tracking in vacuum task
+			Generation: t.targetGeneration, // generate new EC shards as G+1
 		})
 		return err
 	})
@@ -255,7 +261,7 @@ func (t *EcVacuumTask) distributeNewEcShards(sourceNode pb.ServerAddress) error
 				CopyEcjFile:    true,
 				CopyVifFile:    true,
 				SourceDataNode: string(sourceNode),
-				Generation:     1, // TODO: implement proper generation tracking in vacuum task
+				Generation:     t.targetGeneration, // copy new EC shards as G+1
 			})
 			if copyErr != nil {
 				return fmt.Errorf("failed to copy new shards %v from %s to %s: %w", needToDistributeBits.ShardIds(), sourceNode, targetNode, copyErr)
diff --git a/weed/worker/tasks/ec_vacuum/register.go b/weed/worker/tasks/ec_vacuum/register.go
index 859f92737..ef6aaefe0 100644
--- a/weed/worker/tasks/ec_vacuum/register.go
+++ b/weed/worker/tasks/ec_vacuum/register.go
@@ -60,6 +60,7 @@ func RegisterEcVacuumTask() {
 				params.VolumeId,
 				params.Collection,
 				sourceNodes,
+				0, // default to generation 0 (current generation to vacuum)
 			), nil
 		},
 		DetectionFunc:  Detection,