If you are first it is hard to be redundant no mater what the cost.
This is almost interesting. As disks get less and less expensive per GB
the entire issue of a reliable RAID both for capacity, reliability and speed
is an increasingly interesting problem.
The difficult thing today is the backup and restoration from a backup.
Large individual TB disks do take a bit of time to write and verify. Copying from
A to B for an off line copy takes a lot of time.... Vast filesystems of the
modern cloud have additional issues.
With viruses and malware that encrypt filesystems and devices. There is an
honest need for off line read only copies when you are held hostage.
Realistic failure and repair assumptions is a red flag.