If you accidentally deleted your contacts, calendars, or bookmarks from iCloud
You can go to iCloud.com to restore your missing contacts or calendars from an earlier version, or restore your missing bookmarks.
If you recently made changes, you might lose some data. You should create a backup before restoring.
Restore your contacts from an earlier version
When you restore your contacts from an earlier version, the version that you select replaces the existing contacts on all your devices. Before you restore, iCloud saves your current contacts.
Sign in to iCloud.com using your Apple Account.
Scroll down to the bottom of the window, then select Data Recovery.
Select Restore Contacts.
Select Restore next to the date before you deleted the content.
Select Restore again to confirm. After the restore completes, you get a notification on iCloud.com and an email at the address on file with your Apple Account.
Restore your calendars from an earlier version
When you restore your calendars from an earlier version, the version that you select replaces the existing calendars on all your devices. Before you restore, iCloud saves your current calendars. Several things happen when you restore an earlier version of your calendars.
Your sharing settings get erased. You can share the calendars again, or you can ask the owner to share them again.
If you restore to an earlier version that contains events that you recently canceled, event cancel notifications are not sent again.
If you restore to an earlier version that contains events you recently created, invitees still see these events and invitations are not sent again.
To restore your missing calendars:
Sign in to iCloud.com using your Apple Account.
Scroll down to the bottom of the window, then select Data Recovery.
Select Restore Calendars.
Select Restore next to the date before you deleted the content.
Select Restore again to confirm. After the restore completes, you get a notification on iCloud.com and an email at the address on file with your Apple Account.
Restore your bookmarks
When you restore bookmarks, you can choose which individual bookmarks to restore.
Sign in to iCloud.com using your Apple Account.
Scroll down to the bottom of the window, then select Data Recovery.
Select Restore Bookmarks.
Check the box next to the Bookmark you want to recover.
Select Restore.
