The best option for users to take a backup from OST to PST is to use eSoftTools OST to PST converter software. Using this software, users can convert their ost files to PST files in just a few minutes because this software provides some such techniques to users that users will not face any problem in converting the files and there will be no data loss. This software can be easily used... https://www.esofttools.com/ost-to-pst-converter.html