Never used NAS as we don’t see the need.In the case of QLocker and Deadbolt ransomware on QNAP and now Asustore NAS boxes, 2FA, strong passwords, VLANs, firewalls, etc are no defense as they exploited vulnerabilities in the operating system bypassing all those protections. I am not saying that you shouldn't use those things, but in this particular attack they would offer no protection and would not minimize the threat.
Our storage inc music and photos are < 1 TB. Its
stored in One drive, a copy on the PC and an offline back up. A copy of our photos are also on icloud. We haven’t bothered ripping movies.
However, OS and software vulnerabilities are
not uncommon. They are valid, be it NAS, Windows, Mac OS, etc.