You’re right. My emotion got in the way for writing it down properly.
I’m running sailfish on an XA2, did the upgrade through terminal with sfos_upgrade. Using the file browser I can see that .android does not exist any more in my home. In the Jolla Store Android support does not show as item (to be) installed. The back-up of Signal is no longer to be found and in /home/nemo/android_storage.
I made a back-up from the phone, but I’m not convinced the Signal back-up is part of the Sailfish back-up process.