It feels weird to see this called super paranoid, I've been backing up my data ever since my first PC went belly up on me. Didn't have much on it but lost some photos, so now I keep everything backed up and still break out into a sweat the moment my laptop starts making any unusual noise.
Technology isn't perfect so a backup is a must for anything of value: whether financial or sentimental. For a good example of why backups matter, look at the history of Doctor Who. They didn't leave any backups of parts of the original show because they figured those were pointless, re-recording on the physical copies instead. Now the old episodes of the show are being searched for across the Globe, I believe some were even found at some man's home in Brazil. Backups and archiving stuff is essential.