With Mail Backup X, your emails will always be safe.
If you need a long-term backup tool, use this amazing Thunderbird Backup by Year tool. However, the innovation of this program stands in its capability of backing up emails from Gmail and Yahoo or any web-based app that has IMAP or POP services.
You can keep your files on your drive, or add them to flash drives and external HDDs. The program is able to detect all the messages in your mailboxes and you'll never lose your emails again.More details: Thunderbird Backup By Year With Mail Backup X