diff --git a/.vscode/launch.json b/.vscode/launch.json
index 81338d3..f3182e8 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -11,8 +11,9 @@
             "mode": "auto",
             "program": "${workspaceFolder}/main.go",
             "args": [
-                "publish",
-                // "export",
+                "channel",
+                "export",
+                "--pk=3"
                 // https://t.me/yunpanshare/26640
                 // "--alias", "yunpanshare",
                 // https://t.me/Aliyun_4K_Movies/26640
diff --git a/internal/client_channel.go b/internal/client_channel.go
index 92e74b4..f5e40b1 100644
--- a/internal/client_channel.go
+++ b/internal/client_channel.go
@@ -28,6 +28,7 @@ func (t *TClient) Channel(ctx context.Context, channel *tg.Channel, cfg *DBChann
 	request.OffsetID = cfg.MinID + limit
 	request.MinID = cfg.MinID
 
+	logger.Info("get channel message history", zap.Int("min_id", request.MinID), zap.Int("offset", request.OffsetID), zap.Int("limit", request.Limit))
 	history, err := t.Client.API().MessagesGetHistory(ctx, request)
 	if err != nil {
 		return errors.Wrap(err, "messages.getHistory")
@@ -36,7 +37,11 @@ func (t *TClient) Channel(ctx context.Context, channel *tg.Channel, cfg *DBChann
 	messages := history.(*tg.MessagesChannelMessages).GetMessages()
 	if len(messages) == 0 {
 		if cfg.OffsetID > 0 && request.OffsetID < cfg.OffsetID {
-			cfg.Update(ctx, request.OffsetID)
+			logger.Info("no new message, but update config", zap.Int64("channel", channel.ID), zap.Int("offset", request.OffsetID))
+			if err := cfg.Update(ctx, request.OffsetID); err != nil {
+				logger.Error("update config failed", zap.Error(err), zap.Int64("channel", channel.ID))
+				return err
+			}
 			return nil
 		}
 		logger.Info("no new message", zap.Int64("channel", channel.ID))
@@ -52,14 +57,35 @@ func (t *TClient) Channel(ctx context.Context, channel *tg.Channel, cfg *DBChann
 	for _, item := range messages {
 		switch item.(type) {
 		case *tg.MessageEmpty:
+
+			logger.Info("update config", zap.Int64("channel", channel.ID), zap.Int("msg_id", item.GetID()))
+			if err := cfg.Update(ctx, item.GetID()); err != nil {
+				logger.Error("update config failed", zap.Error(err), zap.Int64("channel", channel.ID))
+				return err
+			}
+
 			continue
 		case *tg.MessageService:
+
+			logger.Info("update config", zap.Int64("channel", channel.ID), zap.Int("msg_id", item.GetID()))
+			if err := cfg.Update(ctx, item.GetID()); err != nil {
+				logger.Error("update config failed", zap.Error(err), zap.Int64("channel", channel.ID))
+				return err
+			}
+
 			continue
 		}
 
 		msg, ok := item.(*tg.Message)
 		if !ok {
 			logger.Error("convert msg to *tg.Message failed", zap.Int64("channel", channel.ID))
+
+			logger.Info("update config", zap.Int64("channel", channel.ID), zap.Int("msg_id", item.GetID()))
+			if err := cfg.Update(ctx, item.GetID()); err != nil {
+				logger.Error("update config failed", zap.Error(err), zap.Int64("channel", channel.ID))
+				return err
+			}
+
 			continue
 		}
 
diff --git a/internal/cmd_channel_export.go b/internal/cmd_channel_export.go
index 7a9a96c..9757b16 100644
--- a/internal/cmd_channel_export.go
+++ b/internal/cmd_channel_export.go
@@ -41,11 +41,13 @@ func channelExportCmd(ctx context.Context) error {
 		return err
 	}
 
+	logger.Info("get remote channel info", zap.Int64("uuid", cfg.UUID), zap.String("title", cfg.Title))
 	channel, err := client.ChannelInfoByID(ctx, cfg.UUID)
 	if err != nil {
 		return err
 	}
 
+	logger.Info("exporting history msg", zap.Int64("uuid", cfg.UUID))
 	var continueRetryTimes int
 	for {
 		if err := client.Channel(ctx, channel, cfg, false); err != nil {
diff --git a/internal/common.go b/internal/common.go
index 679be1d..bb0a10f 100644
--- a/internal/common.go
+++ b/internal/common.go
@@ -21,8 +21,8 @@ func InitLogger(cfg *config.Config) error {
 	logWriter := zapcore.AddSync(&lj.Logger{
 		Filename:   cfg.LogFile,
 		MaxBackups: 3,
-		MaxSize:    1, // megabytes
-		MaxAge:     7, // days
+		MaxSize:    100, // megabytes
+		MaxAge:     7,   // days
 	})
 	logCore := zapcore.NewCore(
 		zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()),