having experienced some power outages due to storms or otherwise, my drobos are on a surge protector as well. if you do not have one it might be worth investigating further as could help protect a bit more and relatively cheap too.
(just be careful to understand how to use them properly when used together with other surge protectors/devices, or multiple plug socket extenders and non-surge protected sockets to avoid arcing)
one tip (and it might sound silly) is that i put my drobo psu bricks on a small metal baking tray for extra heat dissipation. nothing touches the metal, apart from the psu plastic case, or the wooden table/covering but they seem to run cooler since doing that)