@max Synchronizing calendars in both directions is a very complex task, and it takes more than just downloading and uploading a single .ics file per calendar. If you have a look at CalDAV and which problems it solves, you will see what the problems are. You will also need a hierarchy: just think about the case that one .ics file contains a certain event, and the other doesn’t. So, does it mean that it has been deleted by the user and should be deleted from the one .ics file, too, or has it just been added and should be added to the other .ics file?
Once every few weeks my calendars from icsdroid disappear and I have to add the URL to the app again. I’ve missed a substansial amount of reminders because of that.
Had never happend to me, and without any further hints I can’t say anything about that. Maybe a 3rd-party app which is messing around with calendars?
I use DAVDroid and OpenTasks on the same device
I can comfirm that my calendar also disappears in the app.
I also use DAVdroid + OpenTasks + ICSdroid on a Oneplus3 with LineageOS 14.1.
I have the same problem. Also have DAVdroid + OpenTasks installed with LineageOS.
Is there any way to do a backup of the calendar settings? I tried using Titanium Backup, but was not able to restore the settings after all calenders disappeared.