It's very unlikely for all of your disks to fail at the same time. Even if they do, that's why you have an offsite backup. The name of the game is redundancy, not longevity.

In practically every use case, two consumer disks will be better than one enterprise disk. Once you start failing enough disks often enough, longevity can be worth the additional cost. Until then, it just isn't.

Actually, it's not uncommon for a batch of disk from a vendor (the same lot #) to have failures.

And again, a backup is fine for deleted data, or fire/ransomware. But for day to day operations, no one is really willing to wait for you to restore from a local backup, much less an offsite backup.

> no one is really willing to wait

And they are willing to wait for you to rebuild your raid array?

Either you lost your data from a disk failure, or you are waiting to lose your data from a disk failure. How are we not on the same page here?

I think if you had worked/managed a SAN, you might realize that a single disk failure is a non-event. I'm not talking about a JBOD or an storage shelf using RAID5, I'm talking about a Netapp or similar system that can easily handle disk failures without interrupting service.