a leading form of data loss ... hardware failures.
And yet, most of the issues we see here about 'data loss' are not from physical drive fail, but something else.
Ransomware, accidental deletion, formatting the wrong drive, installing an OS to the wrong drive, etc, etc.
Sure, a RAID 1 protects against physical drive fail.
But so does a real backup routine. I've experienced that personally.
RAID 1 can be great, IF you need that actual 100% uptime. Say if you were running a webstore, and unscheduled downtime == lost sales.
For the rest of us, not so much.
And any company utilizing a RAID 1 for the uptime consideration also has (or should have) a good backup routine.
And if you can suffer through a whole hour of recovering from the backup Image, then the RAID 1 is not needed.
Far far too many people hear about a RAID 1 and assume it is a "backup". It is not.