Earlier quoted context omitted.
I keep my data safe by storing it on hardware I control and never depending on cloud-service providers.
Any serious amount of data storage requires a hard drive (as opposed to flash), and hard drives are quite fragile. If you drop one on a hard floor it's probably done. And with time they fail for all kinds of other reasons. They are mechanical devices.
What's more important is that I know exactly where it is and who has access to it, and I will continue to have access to it as long as I keep on feeding it electricity.