diff --git a/changelogs/unreleased/9561-Lyndon-Li‎‎ b/changelogs/unreleased/9561-Lyndon-Li‎‎
new file mode 100644
index 000000000..e6661e44d
--- /dev/null
+++ b/changelogs/unreleased/9561-Lyndon-Li‎‎
@@ -0,0 +1 @@
+Fix issue #9460, flush buffer before data mover completes
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 65177f63d..8fbfbef90 100644
--- a/go.mod
+++ b/go.mod
@@ -43,6 +43,7 @@ require (
 	go.uber.org/zap v1.27.1
 	golang.org/x/mod v0.30.0
 	golang.org/x/oauth2 v0.33.0
+	golang.org/x/sys v0.38.0
 	golang.org/x/text v0.31.0
 	google.golang.org/api v0.256.0
 	google.golang.org/grpc v1.77.0
@@ -183,7 +184,6 @@ require (
 	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
 	golang.org/x/net v0.47.0 // indirect
 	golang.org/x/sync v0.18.0 // indirect
-	golang.org/x/sys v0.38.0 // indirect
 	golang.org/x/term v0.37.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
 	golang.org/x/tools v0.38.0 // indirect
diff --git a/pkg/uploader/kopia/block_restore.go b/pkg/uploader/kopia/block_restore.go
index b9fba99fc..4f28a59de 100644
--- a/pkg/uploader/kopia/block_restore.go
+++ b/pkg/uploader/kopia/block_restore.go
@@ -35,6 +35,7 @@ type BlockOutput struct {
 	*restore.FilesystemOutput
 
 	targetFileName string
+	targetFile     *os.File
 }
 
 var _ restore.Output = &BlockOutput{}
@@ -52,7 +53,7 @@ func (o *BlockOutput) WriteFile(ctx context.Context, relativePath string, remote
 	if err != nil {
 		return errors.Wrapf(err, "failed to open file %s", o.targetFileName)
 	}
-	defer targetFile.Close()
+	o.targetFile = targetFile
 
 	buffer := make([]byte, bufferSize)
 
@@ -101,3 +102,23 @@ func (o *BlockOutput) BeginDirectory(ctx context.Context, relativePath string, e
 
 	return nil
 }
+
+func (o *BlockOutput) Flush() error {
+	if o.targetFile != nil {
+		if err := o.targetFile.Sync(); err != nil {
+			return errors.Wrapf(err, "error syncing block dev %v", o.targetFileName)
+		}
+	}
+
+	return nil
+}
+
+func (o *BlockOutput) Terminate() error {
+	if o.targetFile != nil {
+		if err := o.targetFile.Close(); err != nil {
+			return errors.Wrapf(err, "error closing block dev %v", o.targetFileName)
+		}
+	}
+
+	return nil
+}
diff --git a/pkg/uploader/kopia/block_restore_windows.go b/pkg/uploader/kopia/block_restore_windows.go
index 702e0a5e2..c747c3a91 100644
--- a/pkg/uploader/kopia/block_restore_windows.go
+++ b/pkg/uploader/kopia/block_restore_windows.go
@@ -40,3 +40,11 @@ func (o *BlockOutput) WriteFile(ctx context.Context, relativePath string, remote
 func (o *BlockOutput) BeginDirectory(ctx context.Context, relativePath string, e fs.Directory) error {
 	return fmt.Errorf("block mode is not supported for Windows")
 }
+
+func (o *BlockOutput) Flush() error {
+	return flushVolume(o.targetFileName)
+}
+
+func (o *BlockOutput) Terminate() error {
+	return nil
+}
diff --git a/pkg/uploader/kopia/flush_volume_linux.go b/pkg/uploader/kopia/flush_volume_linux.go
new file mode 100644
index 000000000..98234e1b9
--- /dev/null
+++ b/pkg/uploader/kopia/flush_volume_linux.go
@@ -0,0 +1,50 @@
+//go:build linux
+// +build linux
+
+/*
+Copyright The Velero Contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kopia
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+func flushVolume(dirPath string) error {
+	dir, err := os.Open(dirPath)
+	if err != nil {
+		return errors.Wrapf(err, "error opening dir %v", dirPath)
+	}
+
+	raw, err := dir.SyscallConn()
+	if err != nil {
+		return errors.Wrapf(err, "error getting handle of dir %v", dirPath)
+	}
+
+	var syncErr error
+	if err := raw.Control(func(fd uintptr) {
+		if e := unix.Syncfs(int(fd)); e != nil {
+			syncErr = e
+		}
+	}); err != nil {
+		return errors.Wrapf(err, "error calling fs sync from %v", dirPath)
+	}
+
+	return errors.Wrapf(syncErr, "error syncing fs from %v", dirPath)
+}
diff --git a/pkg/uploader/kopia/flush_volume_other.go b/pkg/uploader/kopia/flush_volume_other.go
new file mode 100644
index 000000000..0c0959bda
--- /dev/null
+++ b/pkg/uploader/kopia/flush_volume_other.go
@@ -0,0 +1,24 @@
+//go:build !linux
+// +build !linux
+
+/*
+Copyright The Velero Contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kopia
+
+func flushVolume(_ string) error {
+	return errFlushUnsupported
+}
diff --git a/pkg/uploader/kopia/restore_output.go b/pkg/uploader/kopia/restore_output.go
new file mode 100644
index 000000000..74311d38a
--- /dev/null
+++ b/pkg/uploader/kopia/restore_output.go
@@ -0,0 +1,30 @@
+/*
+Copyright The Velero Contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kopia
+
+import (
+	"github.com/kopia/kopia/snapshot/restore"
+	"github.com/pkg/errors"
+)
+
+var errFlushUnsupported = errors.New("flush is not supported")
+
+type RestoreOutput interface {
+	restore.Output
+	Flush() error
+	Terminate() error
+}
diff --git a/pkg/uploader/kopia/snapshot.go b/pkg/uploader/kopia/snapshot.go
index fce620eb7..1924ed35b 100644
--- a/pkg/uploader/kopia/snapshot.go
+++ b/pkg/uploader/kopia/snapshot.go
@@ -53,6 +53,7 @@ var loadSnapshotFunc = snapshot.LoadSnapshot
 var listSnapshotsFunc = snapshot.ListSnapshots
 var filesystemEntryFunc = snapshotfs.FilesystemEntryFromIDWithPath
 var restoreEntryFunc = restore.Entry
+var flushVolumeFunc = flushVolume
 
 const UploaderConfigMultipartKey = "uploader-multipart"
 const MaxErrorReported = 10
@@ -375,6 +376,18 @@ func findPreviousSnapshotManifest(ctx context.Context, rep repo.Repository, sour
 	return result, nil
 }
 
+type fileSystemRestoreOutput struct {
+	*restore.FilesystemOutput
+}
+
+func (o *fileSystemRestoreOutput) Flush() error {
+	return flushVolumeFunc(o.TargetPath)
+}
+
+func (o *fileSystemRestoreOutput) Terminate() error {
+	return nil
+}
+
 // Restore restore specific sourcePath with given snapshotID and update progress
 func Restore(ctx context.Context, rep repo.RepositoryWriter, progress *Progress, snapshotID, dest string, volMode uploader.PersistentVolumeMode, uploaderCfg map[string]string,
 	log logrus.FieldLogger, cancleCh chan struct{}) (int64, int32, error) {
@@ -434,13 +447,23 @@ func Restore(ctx context.Context, rep repo.RepositoryWriter, progress *Progress,
 		return 0, 0, errors.Wrap(err, "error to init output")
 	}
 
-	var output restore.Output = fsOutput
+	var output RestoreOutput
 	if volMode == uploader.PersistentVolumeBlock {
 		output = &BlockOutput{
 			FilesystemOutput: fsOutput,
 		}
+	} else {
+		output = &fileSystemRestoreOutput{
+			FilesystemOutput: fsOutput,
+		}
 	}
 
+	defer func() {
+		if err := output.Terminate(); err != nil {
+			log.Warnf("error terminating restore output for %v", path)
+		}
+	}()
+
 	stat, err := restoreEntryFunc(kopiaCtx, rep, output, rootEntry, restore.Options{
 		Parallel:               restoreConcurrency,
 		RestoreDirEntryAtDepth: math.MaxInt32,
@@ -453,5 +476,16 @@ func Restore(ctx context.Context, rep repo.RepositoryWriter, progress *Progress,
 	if err != nil {
 		return 0, 0, errors.Wrapf(err, "Failed to copy snapshot data to the target")
 	}
+
+	if err := output.Flush(); err != nil {
+		if err == errFlushUnsupported {
+			log.Warnf("Skip flushing data for %v under the current OS %v", path, runtime.GOOS)
+		} else {
+			return 0, 0, errors.Wrapf(err, "Failed to flush data to target")
+		}
+	} else {
+		log.Infof("Flush done for volume dir %v", path)
+	}
+
 	return stat.RestoredTotalFileSize, stat.RestoredFileCount, nil
 }
diff --git a/pkg/uploader/kopia/snapshot_test.go b/pkg/uploader/kopia/snapshot_test.go
index 2423ba590..984b92af5 100644
--- a/pkg/uploader/kopia/snapshot_test.go
+++ b/pkg/uploader/kopia/snapshot_test.go
@@ -675,6 +675,7 @@ func TestRestore(t *testing.T) {
 		invalidManifestType bool
 		filesystemEntryFunc func(ctx context.Context, rep repo.Repository, rootID string, consistentAttributes bool) (fs.Entry, error)
 		restoreEntryFunc    func(ctx context.Context, rep repo.Repository, output restore.Output, rootEntry fs.Entry, options restore.Options) (restore.Stats, error)
+		flushVolumeFunc     func(string) error
 		dest                string
 		expectedBytes       int64
 		expectedCount       int32
@@ -757,6 +758,30 @@ func TestRestore(t *testing.T) {
 			volMode:       uploader.PersistentVolumeBlock,
 			dest:          "/tmp",
 		},
+		{
+			name: "Flush is not supported",
+			filesystemEntryFunc: func(ctx context.Context, rep repo.Repository, rootID string, consistentAttributes bool) (fs.Entry, error) {
+				return snapshotfs.EntryFromDirEntry(rep, &snapshot.DirEntry{Type: snapshot.EntryTypeFile}), nil
+			},
+			restoreEntryFunc: func(ctx context.Context, rep repo.Repository, output restore.Output, rootEntry fs.Entry, options restore.Options) (restore.Stats, error) {
+				return restore.Stats{}, nil
+			},
+			flushVolumeFunc: func(string) error { return errFlushUnsupported },
+			snapshotID:      "snapshot-123",
+			expectedError:   nil,
+		},
+		{
+			name: "Flush fails",
+			filesystemEntryFunc: func(ctx context.Context, rep repo.Repository, rootID string, consistentAttributes bool) (fs.Entry, error) {
+				return snapshotfs.EntryFromDirEntry(rep, &snapshot.DirEntry{Type: snapshot.EntryTypeFile}), nil
+			},
+			restoreEntryFunc: func(ctx context.Context, rep repo.Repository, output restore.Output, rootEntry fs.Entry, options restore.Options) (restore.Stats, error) {
+				return restore.Stats{}, nil
+			},
+			flushVolumeFunc: func(string) error { return errors.New("fake-flush-error") },
+			snapshotID:      "snapshot-123",
+			expectedError:   errors.New("fake-flush-error"),
+		},
 	}
 
 	em := &manifest.EntryMetadata{
@@ -784,6 +809,10 @@ func TestRestore(t *testing.T) {
 				restoreEntryFunc = tc.restoreEntryFunc
 			}
 
+			if tc.flushVolumeFunc != nil {
+				flushVolumeFunc = tc.flushVolumeFunc
+			}
+
 			repoWriterMock := &repomocks.RepositoryWriter{}
 			repoWriterMock.On("GetManifest", mock.Anything, mock.Anything, mock.Anything).Return(em, nil)
 			repoWriterMock.On("OpenObject", mock.Anything, mock.Anything).Return(em, nil)