# Warning: v2.4.3 corrupts model

**URL:** <https://prepomax.discourse.group/t/warning-v2-4-3-corrupts-model/3165>\
**Category:** Bug Reports\
**Created:** [December 24, 2025, 10:03am UTC](https://prepomax.discourse.group/t/warning-v2-4-3-corrupts-model/3165 "2025-12-24T10:03:01Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [January 23, 2026, 1:18pm UTC](https://prepomax.discourse.group/t/warning-v2-4-3-corrupts-model/3165/13 "2026-01-23T13:18:42Z")

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I made some code changes to prevent data loss, but I could not reproduce the problem, so I am not sure it is a 100% solution. I think the problem occurred because a save attempt failed.

To add an additional safeguard, the .pmx files from an older PrePoMax cannot be overwritten. If the user saves the model to a file that already exists and the file is an older .pmx file, the older file is backed up with a version extension.

So the backup happend when the file is saved and not when the file is opened.

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