During an upgrade to N4 version 4.0.13, you start up N4 for the first time against a database backup that you took from a previous version.
Starting up N4 4.0.13 loads the yard data into the Yard Models and Yard Editor views, and makes it the active yard. When you install and start version 4.0.13 of the Bridge daemon and then the XPS server for the first time, N4 pushes the yard file from the backed-up database to the cache. XPS loads the yard file from the cache. (As does ECN4, if you are using it.) If there is a yard file in the XPS data folder, N4 overwrites it with the yard data from N4.
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