I got a new iPad and used iTunes to sync it. It only transferred the information as of the back up date. How can I add the missing months of info that are on my phone over to new iPad?

我买了新 iPad，用 iTunes 同步。它只导入了备份日期之前的数据。怎么把手机里缺失的那几个月的信息也传到新 iPad 上？