1. Check the draft box: when saving the diary, select Save as Draft Box, and you can find the diary that was not saved successfully in the draft box of Douban Diary.

2. Check the recycle bin: If the contents are deleted by mistake when saving the diary, you can find the diary in the recycle bin of Douban Diary. If the retention time of the recycle bin is not exceeded, you can restore it.

3. Contact Douban customer service: If the above methods fail to retrieve the diary, you can contact Douban customer service to reflect the problem and provide as much information as possible. There may be a special staff to help retrieve the diary.