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 do not have shared reminder lists, go to the next step.
If you do have shared reminder lists, write down which ones you are sharing, whom 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, click in the toolbar, then click Data Recovery.
Click 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, click 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 are not saved.
If you had shared reminder lists, reshare them and ask other people to re-invite 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. Simply follow the steps above to restore the most recent version available.

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iCloud User Guide

Restore your reminders on iCloud.com