How will I retain the catalog backup?
ftp://exftpp.symantec.com/pub/support/products/NetBackup_Enterprise_Server/290198.pdf
Taken from the Windows Installation Guide above:
If you intend to reinstall NetBackup, save the configuration, catalog, and log file information before proceeding. (See “To remove (uninstall) NetBackup servers and save catalog data” on page 78.)