From above link or … or
Contacts:
devel-su -p vcardconverter -e contacts.vcf
or
devel-su -p vcardconverter --export contacts.vcf
Calendar:
devel-su -p icalconverter export calendar.ics
Messages:
commhistory-tool export -groups messages.exp
Calls:
commhistory-tool export -calls calls.exp
(both above working on DB file
/home/nemo/.local/share/commhistory/commhistory.db →
so a simple
tar -cvzf commhist.tgz /home/$USER/.local/share/commhistory/
would also work
Notes:
for notes I do not know tool, so
tar -cvzf notes.tgz /home$USER/.local/share/jolla-notes/
will do the trick