When I logged in today after a few days away I realised I was not getting any Task Reminders, although there should have been several for repeating tasks which were due whilst I was away. On looking in the Calendar window I found that all the Tasks had disappeared. How do I get them back? (I do have the computer backed up with Macrium Reflect, so I could restore the file(s) from last week, but I have no idea where the Calendar data is stored.)