iCloud is a convenient hub for syncing a large array of personal data, some of it secret—like passwords. But if you lose or sell a device or it’s stolen, you can wind up potentially exposing your information in large and small ways. Apple does protect your device’s data by requiring a passcode, password, or a Touch ID/Face ID requirement for accessing the hardware, and that’s enough of a barrier most of the time, coupled with Apple prompting for a password or other validation when you try to make purchases at its various media and app stores.
But even if you can’t get access to the device, you can sever its connection to your iCloud account, which can reduce some of the impact.
