This could be useful for bootstrapping a shared-nothing cluster or a disaster recovery node. A comparable amount of space in a storage array might occupy a 2-4

This could be useful for bootstrapping a shared-nothing cluster or a disaster recovery node. A comparable amount of space in a storage array might occupy a 2-4U chassis, which would be somewhat less convenient to transport. This thing isn't going to be cheap, so you'd probably want a more frequent transfer to justify it. Maybe sneaker net database journals or backups every week?