Hard drives from the last 20 years are now slowly dying.
Drive failure in the 00s was really common. I lost 2 or 3 separate drives from different mfg over the course of a couple years. Newer drives are better but even in modern nas setups, I planned on losing at least 1 drive per year on a 4 drive nas even fresh out of the box.
Always keep data your care about in at least 3 places and in at least 2 different mediums with one preferably offsite. I like to have one drive in use, one backup that sync’s daily, and one that I keep in cold storage unplugged. Then swap the sync drve and cold storage drive every so often.
So far over a span of maybe 40 years of computing I’ve only lost two HDDs. A number of 5 1/4 floppies back then but that was typical. Both drives I was able to pull most of the info off to a new drive, so yay for the mechanical drive, where a SSD you’re left with either a miracle, or looking for the experts to retrieve something. I’m no power user, so perhaps that’s part of the reason, but ever since we got into the giga and tera range of storage my first thought is always…wow, that’s a lot to lose at one time.