How do I backup all my emails?

The most reliable way to back up all your emails is to use a dedicated email backup software solution that integrates directly with your mail server. For organizations using Exchange, Office 365, or Gmail for Business, a solution like Intradyn connects via standard IMAP/POP and SMTP protocols and performs automated full and incremental backups — no manual effort required. For businesses, automated cloud or on-premise backup software is the recommended approach.