Email will inevitably fail so if you foolishly depend on it, learn to back it up and restore it

If you insist on using email as a file management system, archive system, CRM, database, contact system, knowledge management system , etc then learn how to backup your email and practise restoring your email because it will inevitably fail no matter how reliable your email server and client are. If you don't have time, then pay somebody or do the right thing and move stuff out of email to CRM, blogs, wikis, to-do systems, etc!