when hardware is pushed, the best you can do is be reasonable with what you're expecting for output; and monitor all equipment.
mining equipment isn't life threatening if it fails, it doesnt need a disaster recovery plan.
What about the big mining rigs that generate alot of profit and could cause the loss of investors if being destroyed? I understand that your home mining rig does not need an IT DRP, but there are companies that run mining rigs as business. Critical processes often run from these rigs like cloud mining.
i'm guessing you're talking about having another set of mining rigs on standby?
mining has always been cut-throat competitive. if someone went as far as to spec up a set of 'standby' rigs for their setup, i'd imagine they'd end up using them full time in a matter of hours.
in terms of redundant power, redundant network, redundant stratum/coin daemon instances - thats a given with any setup.