How to back up the chat records of mobile QQ?

If you use a vivo mobile phone, you can see how to back up QQ messages on your mobile phone:

Enter QQ-Yes-Chat interface of the contact you want to back up-Upper right corner-"≡"-Find chat records-Circle and horizontal line icon in the upper right corner-Chat records roaming. After setting the roaming days, you can view the chat record even if you change your mobile phone (you need to open a member when roaming for more than 7 days).

Note: QQ can back up a friend's chat information separately, but it cannot back up all the contacts' chat records at one time.