The best way to save the file is to save it in PST. This file format keeps the data in a systematic order, hence considered a priority. But that does not mean that this file is not prone to corruption, it is equally prone to corruption. Reasons behind corruption could be its oversize, abrupt closing, or being infected by a virus.
How to Repair PST File:
ScanPST.exe, the manual method, is not recommended because of its limitation of only processing the 2 GB file for repairing. There are a few more limitations of the scanPST.exe technique. So here below, we are discussing the easiest way possible.

Users can use this tool in a free demo version to process the first 50 items per folder.
Read More: https://www.shoviv.com/blog/how-to-repair-outlook-pst-2019-2016-2013-and-2010-data-files/