How to restore data from iCloud

Michael E. Cohen, TidBITS:

iCloud, however, much like real clouds, is notoriously opaque. It’s hard to see just what you have stored in it. Nonetheless, Apple has made it easy, at least, to fix some truth-related issues in iCloud, and you can do it with a readily accessible tool: a Web browser on any Mac or PC. With it, you can revert to backups of your contacts, calendars, reminders, and shared bookmarks, and even restore files deleted from your iCloud Drive.

If you have an iCloud account, this is worth a walk through, just to get a sense of the available options.