Prepare the Reference Data Directories
If you install or copy any reference data file to a non-default directory within the PowerCenter directory structure, back up the directory before you upgrade.
If you install or copy any reference data file to a directory outside the PowerCenter directory structure, you do not need to back up the directory.
By default, the upgrade operation preserves the contents of the following reference data directories:
Parent directory for the reference dictionary files.
Parent directory for the address reference data files.
Parent directory for the identity population data files.
Record the directory location, so that you can restore the directory to the directory structure after you upgrade.