Don't rely on SMART or anything else to notify you the drive is failing.I figured the whole point of SMART tech is to notify you of possibly failure so that you can then quickly recover your files on that drive and get a new one, but maybe I am mistaken.
You need to be prepared for that ALL the time.
Drive fail can happen anytime, and quite suddenly.
With no warning.
Backups are like car insurance.
You can't buy car insurance 2 minutes after the crash.