Carrying apple mail backup using the Mail Backup X has its own benefits, not to mention its multiple features. You can use this app not only to backup and archive files but also to automatically backup data form USB cables, search mails from your inbox, change your files from olm to pst and several other formats and vice versa. Its integrated mail converter engine and FTP client are the star of the app and provide seamless service to users willing to carry out heavy tasks with this app.