OK. Found it. Thank you.
I did turn off any synch to my google account, that I do not intend to use as a repository for my data.
And I am somehow angry: the adresses/contacts I transferred from my private computer to my phone where all immediately exported as google contacts. Now all deleted but big G had them for 24 hours, hence for ever I suppose. I do not have serious things to hide in my contacts, but I do not see why they should be transferred by default to the other end of the world.
This is... hmmm... I am trying to be polite... this is... very questionnable.
- You cannot set up your Android without linking it to a google account.
- So you link you phone to a google account for the sole purpose of starting up your phone.
- BY DEFAULT and without asking consent, synch is turned ON for this google account.
- Then all the data you transfer to your phone are leaked to Google...
and I do not remember seeing a warning for this.