Thank you Scott,
That did the trick (a case of "Read The Funny Manual" i suppose :-[)
but… after doing the upgrade wich took half an hour, i was left with an unresponsive system.
I tried rebooting a couple of times, but no luck.
So i did the physicaldikwrite anyway and restored my backup.
Everything seems to work, except for the captive portal on the WIFI interface. I disabled it for the time being to do some further testing.
One more question is there a way to backup the rrd database to an external system adn restore it later?
rgds,
Hellsblade