To backup your Facebook chat, you can follow these steps:

1. Using Facebook Website:

   – Go to Facebook.com and log in to your account.

   – Click on the Messenger icon in the top right corner to open Messenger.

   – Find the conversation you want to backup.

   – Open the conversation and click on the gear icon (Options) in the top right corner.

   – Select “More” and then choose “Export Chat.”

   – You’ll have the option to choose whether to include photos and videos in the backup.

   – Once you’ve selected your preferences, click on “Start Export.”

   – Facebook will notify you when your chat is ready to download. You’ll receive a notification or an email with a link to download the chat history.

2. Using Messenger App:

   – Open the Messenger app on your smartphone and log in if you’re not already logged in.

   – Find the conversation you want to backup.

   – Long-press on the conversation until a menu appears.

   – Select “More” or the “i” icon (Info).

   – Scroll down and select “Export Chat.”

   – Choose whether to include photos and videos, then tap “Export.”

   – Depending on your device, you’ll have the option to save the chat as a file or send it to another app for storage.

By following these steps, you should be able to backup your Facebook chat conversations either through the Facebook website or the Messenger app.