I have several important email accounts stored in MBOX format from clients like Thunderbird and Apple Mail. I want to create a secure backup so that my emails remain safe and accessible in the future. However, I am confused about which file format is best for MBOX email conversion for backup purposes. Should I convert MBOX to PST, PDF, EML, or another format? I am looking for a reliable solution that preserves email data, attachments, and folder structure. What is the best approach?