Re: I refute your comparison
As someone who sells and implement massive disk based solutions, you should be aware you don't use scsi or sas drives for the backup target, you use large, cheap drive in a raid for both the on site and off site locations. If you are using scsi or sas drives you are doing it wrong.
We currently deploy arrays consisting of however many 2TB 7500 RPM drives they need at the rate of 2.5x the data they could store, with a few a decent raid controller to manage them.
Our off site location is a blackblaze box array, and uses some proprietary software to further distribute the data between them, making it redundant at the physical destination level as well.
Still cheaper to implement than tape, and we charge $.50/gig for our off site fees, along with a $75/mo software license (they do not purchase the software used to backup, just the on site hardware)
Anon to keep company from getting mad.