Missing personal calendar

Hi,

after the last "akonadictl fsck" I am missing suddenly my personal calendar with all my dates gone. Since I do 
regular backups, I wonder where all the data is stored. Any documentation I've found tell me, that korganizer 
uses an .ics file, but the youngest .ics file on my disk (and backups) is from December last year. Yes, it contains 
(old) dates, but where have all the dates been stored in the mean time?

Regards,
Jörg