Yahoo Backup Software
The Yahoo backup software is a professional tool used to backup Yahoo mail files to multiple file formats and cloud applications. The tool is capable to backup Yahoo mail data to PST, PDF, MSG, MBOX, EML, EMLX, Office 365, Gmail, G Suite, and Exchange Server.
https://www.syscurve.com/yahoo-backup-tool.html
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Ankur Goswami commented
If you have lost your file in Yahoo Mail and still facing problems with backup then don't worry you should read this blog Backup Yahoo Mail. This blog will give you the best solution to backup files without any lost data. Also if you are looking for a third-party solution then you will get amazing software to run it and use for converting mail from Yahoo mail to PST, MSG, MBOX etc. It will be also helpful to convert Yahoo Mail to other clients like IMAP, Thunderbird, and Office 365.Just click this link to read this blog.