Ummarked as required - update 4.4 - 5.0

Hello together

is there an easy way to unmark an app in version 4.4 so that the updater is ignoring the app. Without deinstalling the app of course.
I still have a server with the old bareos app and would like to:

  1. update 4.4 → 5.0
  2. trying to ‘migrate’ the installation to the underlying debian 10 repos. Keeping the postgreSQL-db of bareos.
    Is this possible?

Or: Is there a whitepaper for migrating the previous UCS4.4 Bareos to another server?