A Backup You Have Never Tried to Restore Is Not Actually a Backup

The little cloud icon shows a green checkmark, so the assumption is that everything is safe. But backups fail silently far more often than people expect — a corrupted file, an expired subscription, a sync that quietly stopped months ago while the icon kept reporting success.

A backup is only proven once you have actually restored something from it. Once or twice a year, pick a random file or folder and restore it from your backup on purpose — if that fails, you want to find out on a calm afternoon, not during an actual disaster.