My paranoia began with losing 2 hard drives in a row. I was devastated by the first loss. Having been active on the internet since 1991 and keeping all of my mail...well, losing it was a traumatic blow. I recovered some of my stuff, then the drive I was recovering onto died and nothing was salvageable from it.
So yes, I'm paranoid. I run mirrored data drives for the redundancy and I'm looking to implement a higher level of RAID.