So after getting back to a just installed SBS Server, BPA reported 'SBS Server is in a journal wrap condition'. It turns out, the safest fix for that, is shown in the link here: https://community.spiceworks.com/how_to/show/12387-sbs-2011-bpa-reports-journal-wrap-condition. Thanks mate!

Don't forget to backup your system state before that, just in case...