Data loss is just hand-in-hand with computers in general and anything we're writing information to any multitude of different types of digital media and there's different ways to do that be it, magnetic disk, magnetic tape flash media stuff like that. Like anything, nothing is a guarantee in life and there's ways that it can break.
Hard drives are kind of one of the last mechanical parts in a computer these days. We're moving beyond that with SSDs and flash media now but a lot of stuff is still on spinning disks and there's associated risks with that as well. Frankly an entire industry is built around mitigating that risk, so it's something that's worth considering and literally everything you do. I mean large companies spend a lot of money to avoid or at least prepare for these kind of things.