Connect your phone to your computer using a USB cable

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Open WhatsApp on your phone
Go to Settings > Chats > Chat Backup
Click on 'Back up now'

Once you have successfully backed up your messages, you can move on to the next step.
Step 2: Transfer the backup file to your PC
After backing up your messages on your whatsapp number database phone, you will need to transfer the backup file to your computer. You can do this by following these steps:

Locate the backup file on your phone (it is usually saved in the WhatsApp folder)
Copy the backup file and paste it onto your computer
Step 3: View your messages on your PC
Now that you have transferred the backup file to your computer, you can view your WhatsApp messages on your PC. You can use a third-party software or tool to open the backup file and view your chat history.

Step 4: Save your messages
If you want to save your messages in a readable format on your computer, you can choose to export your chat history as a text file or PDF. This way, you will have easy access to your messages whenever you need them.