I don’t think there’s even a way to delete all of the lists and groups at once.Īs far as I can tell the data is now permanently gone from both locations with no option to undo or backup. I very very definitely did not accidentally delete the wrong thing. One moment there was only a single list remaining in iCloud (and everything as it should be under Microsoft) and then as I deleted the final list, everything under Microsoft disappeared as well. It happened very quickly so I’m not exactly sure what happened, but what I think happened is that as I deleted the very last list of reminders in iCloud (so nothing remained under iCloud reminders) it also deleted everything under Microsoft. The following day (today) I verified that everything had copied across successfully to Microsoft and then used Reminders.app to delete the iCloud copy of my reminders. I closed Reminders.app and left it over night, double checked that everything was safe in both locations (ICloud and Microsoft). I copy and pasted all my reminders from the iCloud section of Reminders.app to Microsoft. Using Reminders.app I created a matching set of Lists and Groups in the Microsoft section of Reminders.app. Using System Preferences I added a Microsoft account and enabled Reminders (no other services). This allows him to share reminders with me using Microsoft ToDo. I needed to share my reminders with someone on a Windows computer so decided to use the Microsoft reminders backend with the Apple Reminders.app. Use TimeMachine to recover ~/Library/Reminders & ~/Library//Containers/-do-macĭetails of what I think happened in bug report to Apple:.Use System Preferences to disable Reminders in iCloud and Exchange (to make sure nothing crazy happens with sync’ing).

I have current TimeMachine backups, but I’m not sure how best to recover data back to Reminders.app or Microsoft Todo.

The bug report I sent to Apple is below in case it’s interesting to anyone. Arg! Reminders.app just ate 10 years of my accumulated brain.

How to get rid of reminders on mac