While no business likes to think it would hire someone with destructive tendencies, former employees have been known to turn vindictive. This can be especially deadly for smaller businesses, where a small team often means everyone have access to almost every facet of the IT systems. That's why it's best to keep that "plus one" copy offline, at a separate geographical region and out of their reach. Having the copy in a separate physical location also protects a business from fires, floods and other localized natural disasters.
Data Storage Strategy Depends on Budget, Data Volume
Ultimately, the combination of storage you need will depend on your volume of data and available budget. Startups with modest data needs and a low budget, for example, could benefit from the Transporter and its minimal equipment costs. Data could be backed up onto a DAS that's taken offline on a periodic basis.
A business with more substantial storage needs, though, may want to deploy two NAS appliances in separate offices. These could be set to sync with each other over the Internet or VPN. The same arrangement could be made for businesses with only one office, though the second NAS could be a disaster protected one. Data in both cases could be incrementally backed up from one NAS to a cloud storage provider.
Whatever they deploy, businesses generating large volumes of data may find that backing up to the cloud may not be tenable. Such businesses will likely need to invest in a tape drive, with data backed up on tape cartridges kept at an off-site location.