I think about 8 years. I’m not sure. I bought it when 6TB drives were the best value for money. I’ve managed a few other storage systems in my life and usually they fail soon, ideally while still under warranty, or they last quite some time. But there are exceptions. And I’m not entirely up to date anymore. I wouldn’t recommend skimping on backups. At some point in time they will fail. But in my experience it’s completely random. You can’t expect a drive to last like 2 or 5 years. They’ll do whatever they want. And on average last way longer than 2 years or whatever refurbished drives have lasted when they get re-sold.
If you google Ulephone and alarm clock, you’ll find some more people complaining. It’s likely something the manufacturer did to save battery. I’d say the preinstalled (native) alarm clock app is most likely to work, maybe they tested their own apps. Everything else is likely to be nuked on inactivity during the night.