Versioning in the multi-user projct

Versioning in the multi-user projct

Dear support,
I have an issue with versioning in the multi-user project set-up. I have activated "versioning active" property for the project, and defined main version number. However, minor version number is not being increased when the back-up created. In the manual i have found a short note, related to the subject:
Information
Versioning also works with distributed engineering. At this file project.ini must be
locked for changes for a backup at the server. XML files are only saved for local

Please explain in more details, what exactly needs to be done with "project.ini" file. What is the exact location of the file, and what is understood by "locked"?
Regards.

This is a migrated post! Originally posted on 11.05.2016 by user amigo. Please be aware that information can be outdated.