“I trusted all my important data to a single point of failure and now I’m screwed”.

So, yes, I respect that SanDisk’s drive may have a manufacturing defect and that sucks but they have to share the blame for this. Seriously, drive mirroring is a thing and every single OS supports it out of the box. A proper RAID system is a thing and even better. Adding duplicate storage, be it cloud, another NAS or backing up to tape is even better still. It’s the 21st century, you should know that by now if your literal job is based on storing data.