We know that your messages are important to you, and it is important to us that you are able to save them.
On all platforms, we provide you the option to send your chat history in a .txt file, attached to an email.
Learn how to export your chat history on: Android | iPhone | Windows Phone | Nokia S40 | BlackBerry | Nokia S60 | BlackBerry 10
To learn about how to recover messages from a backup, please read this article.
Cheers,
WhatsApp Support Team