WhatsApp provides the option to Backup selected or specific Chats in addition to its automated Backup feature, which automatically backs up all your Chats to iCloud and Google Drive.
This feature can be helpful, if you want to save an important WhatsApp Chat as a record of your conversation or you find the need to forward a specific WhatsApp Chat to someone or want to save an individual or Group Chat before deleting it.
Backup Specific WhatsApp Chats on iPhone and Android
You can Back up a selected or specific Chat in WhatsApp by using the “Export Chat” feature, which creates a copy of the selected conversation (with or without photos/vides) in an exportable format (.txt file). Once the selected Chat is saved, WhatsApp provides the option to export the Backup File by using Email, iMessage and other supported apps.
The allowed size of the exported Chats in WhatsApp can be up to 10 MB without media and 100 MB with media (which is saved separately).
Also, Chats saved by the “Export Chat” feature in cannot be imported back into WhatsApp, they are only meant for archiving, sharing and printing purposes, Hence, if you are looking for Chat Backup that can be transferred to a new iPhone, you will have to go for a full WhatsApp Backup: How to Backup WhatsApp to iCloud on iPhone.
1. Backup Specific WhatsApp Chats on iPhone
1. Open the specific WhatsApp Chat that you want to Back up.
2. On the Chats screen, tap on the Contacts Name.

3. On the Contact Info screen, scroll down and tap on Export Chat option.

4. On the pop-up, select whether you want to Attach Media or backup the Chat Without Media.

5. On the sharing menu that appears, select Messages, Mail or any other App that you want to use to Export this WhatsApp Chat to yourself.

6. Follow the instructions to send the Chat Backup using Messages, Email or any other supported App to your own self.
Note: You can also save WhatsApp Chat to iCloud Drive by selecting Save to Files option.
2. Backup Specific WhatsApp Chats on Android Phone
Follow the steps below to Backup Specific WhatsApp Chats on Android Phone or Tablet.
1. Open the WhatsApp Chat that you want to Back up.
2. On the next screen, tap on 3-dots menu icon and select More in drop-down menu.

3. On the next screen, tap the More Icon and select Export Chat option in the drop-down menu.

4. On the pop-up, select whether you want to Include Media or export the Chat Without Media.

5. On the next slide-up menu, select Google Drive, Gmail or any other App that you want to use to export the Chat to yourself.
If you selected Gmail, you can Email the Chat to your own Gmail Address on the next screen and download the Chat to your computer from Gmail.