Your WhatsApp chats are automatically backed up every day at 3 am and saved to your phone's memory and/or on your SD card depending on your settings. You can also periodically back up your WhatsApp chats to [OneDrive](https://onedrive.live.com/about/en-us/support/). If you uninstall WhatsApp from your phone, but don't want to lose any of your messages, be sure to manually back up or export your chats before uninstalling.