Restore your reminders on iCloud.com
You can restore your reminders and reminder lists (together with your calendars and events) from an earlier version that was automatically archived in iCloud.
If you have shared reminder lists, all sharing information is removed when you restore them. You have to share your reminder lists again and ask other people to re-invite you to share their reminder lists.
If you don’t have shared reminder lists, go to the next step.
If you do have shared reminder lists, write down which ones you’re sharing, who you invited to share each one, and whether each participant can view and edit or only view. Also note which reminder lists other people are sharing with you.
On iCloud.com, tap
in the toolbar, then tap Data Recovery.Tap Restore Calendars and Reminders.
Available versions are listed by the date and time they were archived.
To the right of the version you want to restore, tap Restore.
There may be more versions than can be displayed. Scroll to see them all.
Note: Wait until iCloud finishes restoring your reminder lists before you change them. During the restore process, any changes you make aren’t saved.
If you had shared reminder lists, reshare them and ask other people to reinvite you to share their reminder lists and calendars. See Share a reminder list on iCloud.com.
The restored reminders and reminder lists appear on all your devices with Reminders turned on in iCloud settings.
If you change your mind, you can restore the reminders and reminder lists you were using. Just follow the steps above to restore the most recent version available.