My TeamCity instance has quite a large BuildServer directory and I'd like to know what I can avoid backing up before upgrading to the latest version. The upgrade documents states:
If you decide to skip data backup under <TeamCity Data Directory>/system directory, make sure you note the most recent files in each of artifacts, messages and changes subdirectories and save this information. It will be needed if you decide to restore the database backup with TeamCity Data Directory corresponding to a newer state then the database.
What does "make note of the most recent files" mean? The most recently touched artifact and message directories? What do I do with this information once I have it, or in the event I need to restore from backup?