Thunderbird emails can be easily back up by following the below steps Close all applications including Thunderbird email client for efficient back up. Open 'file explorer' and visit to the following directory - C:/Users/username/AppData/Roaming/Thunderbird/Profiles/ProfileName Here 'username' is the Windows username and 'Profile name' is of the Thunderbird profile which is registered and used for emails. Now copy the entire 'Profile' directory of the user profile and store it in a particular location. Copy back up profile to the original location when you want to restore Thunderbird. In this way, the user can back up and restore Thunderbird emails as per need.