diff --git a/backup-daemon/databackupproxy.h b/backup-daemon/databackupproxy.h
index 8550ce7..d73b3dc 100755
--- a/backup-daemon/databackupproxy.h
+++ b/backup-daemon/databackupproxy.h
@@ -58,7 +58,7 @@ private:
 
 protected:
     // 判断是否增量备份
-    bool isIncBackup();
+    virtual bool isIncBackup();
 
     /**
      * @brief 根据场景获取rsync命令参数
diff --git a/backup-daemon/udiskdatabackupproxy.cpp b/backup-daemon/udiskdatabackupproxy.cpp
index ce171c6..b552b65 100755
--- a/backup-daemon/udiskdatabackupproxy.cpp
+++ b/backup-daemon/udiskdatabackupproxy.cpp
@@ -122,6 +122,30 @@ void UDiskDataBackupProxy::deleteFailedData()
     parse.deleteItem(m_curUuid);
 }
 
+/**
+ * @brief 判断是否增量备份
+ * @return true,增量备份； false，全量备份
+ */
+bool UDiskDataBackupProxy::isIncBackup()
+{
+    QString backupPath;
+    ParseBackupList::BackupPoint point;
+    if (m_backupWrapper.m_uuid.isEmpty()) {
+        return false;
+    } else {
+        backupPath = m_backupWrapper.m_prefixDestPath + BACKUP_SNAPSHOTS_PATH + "/" + m_backupWrapper.m_uuid + "/data";
+    }
+
+    backupPath.replace("//", "/");
+    if (Utils::isDirExist(backupPath)) {
+        m_backupWrapper.m_bIncrement = true;
+        m_backupWrapper.m_type = BackupType::INC_BACKUP_DATA;
+        return true;
+    }
+    return false;
+}
+
+
 /**
  * @brief 校验剩余空间是否满足备份
  */
diff --git a/backup-daemon/udiskdatabackupproxy.h b/backup-daemon/udiskdatabackupproxy.h
index 6721d55..213f401 100755
--- a/backup-daemon/udiskdatabackupproxy.h
+++ b/backup-daemon/udiskdatabackupproxy.h
@@ -42,6 +42,8 @@ private slots:
 protected:
     // 失败则删除相应数据
     virtual void deleteFailedData();
+    // 判断是否增量备份
+    virtual bool isIncBackup();
 
 private:
     // 计算备份所需空间大小