Raid 5 in a simple 3 disk array with a 4th disk as external backup drive.What type of RAID are you running?
Our servers had plenty of back up power.I know very little about computers but a backup generator with a transfer switch and a UPS (uninterruptible power supply) system would do the trick keeping your computers going (uninterrupted) if the power company fails in their duties. :face-icon-small-ton
Spell check needs to know that uninterruptible is spelled correctly. :face-icon-small-hap