FAQ

In a group chat, the second check marks will appear when all participants in the group have received your message. The two blue check marks will appear when all participants in the group have read your message.
WhatsApp automatically makes backups every day at 4 AM and stores them in the WhatsApp folder of your Android phone. This folder is either located in your device's internal memory or external microSD card. To restore the most recent backup, you will need to uninstall and reinstall WhatsApp.
If you see two blue check marks next to your sent message then the recipient has read your message. In a group chat or broadcast message, the check marks will turn blue when every participant has read your message.

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