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/11795604-ℹ-phoenix-project-copies-backups