Take backup from OST file to PST without any error and damaging the data in the OST file. You can use the SysInspire OST to PST Converter tool. This software can convert any size of the OST file due to its advanced feature mass conversion and also you can convert any OST with specific date and time by the feature of email filtration. If you want to convert your OST file into different then you also convert it in 15+ different formats like PST, Office 365, EML, EMLX, CSV, VCF, IMAP Account, HTML, MSG, Zimbra Desktop and many more. 

Know more:- Take a Backup from OST file to PST