# Why do i have .phxlastload or .phxbackup files being created

**URL:** <https://forum.certara.com/t/why-do-i-have-phxlastload-or-phxbackup-files-being-created/4337>\
**Category:** Certara Forums\
**Created:** [October 21, 2025, 9:53am UTC](https://forum.certara.com/t/why-do-i-have-phxlastload-or-phxbackup-files-being-created/4337 "2025-10-21T09:53:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SimonDavis](https://avatars.discourse-cdn.com/v4/letter/s/d9b06d/32.png) [@SimonDavis](https://forum.certara.com/u/SimonDavis)\
**Post date:** [October 21, 2025, 9:53am UTC](https://forum.certara.com/t/why-do-i-have-phxlastload-or-phxbackup-files-being-created/4337/1 "2025-10-21T09:53:29Z")

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i’ve had a few people ask about these and I thought it would be useful to point people to these two tip pages - essentially you can ignore them unless you need to return to previous version of a project. it’s not a replacement for good versioning practice but might help as it is implemented automatically. Periodically you could clear out these out if you are no longer working on that project. Simon.

[https://help.certara.net/en/articles/8671091-how-to-restore-corrupt-projects-from-phoenix-backup-files](https://help.certara.net/en/articles/8671091-how-to-restore-corrupt-projects-from-phoenix-backup-files)

[https://help.certara.net/en/articles/11795604-ℹ-phoenix-project-copies-backups](https://help.certara.net/en/articles/11795604-%E2%84%B9-phoenix-project-copies-backups)