diff --git a/pkg/storage/logfile/csv.go b/pkg/storage/logfile/csv.go
index e91df8c..6bd3a2b 100644
--- a/pkg/storage/logfile/csv.go
+++ b/pkg/storage/logfile/csv.go
@@ -112,8 +112,6 @@ func (cl *csvLogfile) Write(measuredValues []*types.MeasuredValue) error {
 	}
 	defer f.Close()
 
-	writeCreationDate(measuredValues)
-
 	w := csv.NewWriter(f)
 
 	for _, measuredValue := range measuredValues {
diff --git a/pkg/storage/logfile/json.go b/pkg/storage/logfile/json.go
index d97f6f7..be19d4e 100644
--- a/pkg/storage/logfile/json.go
+++ b/pkg/storage/logfile/json.go
@@ -52,8 +52,6 @@ func (jl *jsonLogfile) Write(measuredValues []*types.MeasuredValue) error {
 		}
 	}
 
-	writeCreationDate(measuredValues)
-
 	f, err := os.Create(jl.logfile)
 	if err != nil {
 		return fmt.Errorf("%v %v: %v", errorLogfileCreate, jl.logfile, err)
diff --git a/pkg/storage/logfile/logfile.go b/pkg/storage/logfile/logfile.go
index aca6727..9a5ff1b 100644
--- a/pkg/storage/logfile/logfile.go
+++ b/pkg/storage/logfile/logfile.go
@@ -2,9 +2,6 @@ package logfile
 
 import (
 	"path/filepath"
-
-	"github.com/go-flucky/flucky/pkg/internal/format"
-	"github.com/go-flucky/flucky/pkg/types"
 )
 
 // New returns a log file with basic functions for reading and writing data. The
@@ -31,13 +28,3 @@ func New(logfile string) Logfile {
 		}
 	}
 }
-
-func writeCreationDate(measuredValues []*types.MeasuredValue) error {
-	now := format.FormatedTime()
-	for _, measuredValue := range measuredValues {
-		if measuredValue.CreationDate == nil {
-			measuredValue.CreationDate = &now
-		}
-	}
-	return nil
-}
diff --git a/pkg/storage/logfile/xml.go b/pkg/storage/logfile/xml.go
index f7e2a8f..6fda3ba 100644
--- a/pkg/storage/logfile/xml.go
+++ b/pkg/storage/logfile/xml.go
@@ -60,8 +60,6 @@ func (xl *xmlLogfile) Write(measuredValues []*types.MeasuredValue) error {
 	}
 	defer f.Close()
 
-	writeCreationDate(measuredValues)
-
 	cachedMeasuredValues := new(MeasuredValues)
 
 	for _, measuredValue := range measuredValues {
diff --git a/pkg/storage/storage.go b/pkg/storage/storage.go
index e83da3c..a3539be 100644
--- a/pkg/storage/storage.go
+++ b/pkg/storage/storage.go
@@ -106,24 +106,28 @@ func Round(measuredValues []*types.MeasuredValue, round float64) {
 // data. The scheme must be matched to a storage provider, if the scheme is not
 // implemented, the function returns an error
 func Write(ctx context.Context, measuredValues []*types.MeasuredValue, storageEndpoint *url.URL) error {
+	writeCreationDate(measuredValues)
 	switch storageEndpoint.Scheme {
 	case "file":
 		measuredValueLogfile := logfile.New(storageEndpoint.Path)
-		storedMeasuredValues, err := measuredValueLogfile.Read()
-		if err != nil {
-			return err
-		}
-		storedMeasuredValues = append(storedMeasuredValues, measuredValues...)
-		return measuredValueLogfile.Write(storedMeasuredValues)
+		return measuredValueLogfile.Write(measuredValues)
 	case "postgres":
 		database, err := db.New(storageEndpoint)
 		if err != nil {
 			return err
 		}
 		defer database.Close()
-		if err := database.InsertMeasuredValues(ctx, measuredValues); err != nil {
-			return err
+		return database.InsertMeasuredValues(ctx, measuredValues)
+	default:
+		return fmt.Errorf("No supported scheme")
+	}
+}
+
+func writeCreationDate(measuredValues []*types.MeasuredValue) {
+	now := format.FormatedTime()
+	for _, measuredValue := range measuredValues {
+		if measuredValue.CreationDate == nil {
+			measuredValue.CreationDate = &now
 		}
 	}
-	return fmt.Errorf("No supported scheme")
 }