If you accidentally deleted or somehow lost your WhatsApp chat history, you can restore it. WhatsApp automatically stores your chats from the last seven days, creating a backup every night at 2am and saving that to your phone itself. It's also possible to set up your phone to back your chats up to the cloud. If you just need to restore deleted chats from your most recent backup and you already had your information backed up to the cloud, uninstalling and reinstalling the app is the easiest way. However, since your device stores seven day's worth of nightly backups, it's also possible to go back to a specific day during the last week, using those backup files.