Aryson Yahoo Backup Tool - Version 19.0 Yahoo backup tool is among the best software for the Windows platform which can backup Yahoo mail data easily. This software provides its users the facility to save the emails in multiple file formats like PST, MSG, MBOX, PDF, TXT, HTML, EML, etc. Aryson Yahoo backup tool has got multiple features like date range filter and is supported by all the major versions of Windows. Yahoo backup tool also provides the facility to backup additional data.