I'm using a quite similar way of keeping backups: external HDD's that are connected only at backup time. And I use SSD's everyday (1 system disk and one for my Poser stuff).
I still have from the time I was an employee a Synology NAS for all kind of documents, 3D resources, etc..
That plus a regular check of all my connected disks using a portable version of ClearDiskInfo.

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gaming, Asus Tuf Gaming RTX 4070 OC Edition, 1+2 TB SSD's, 6+4TB HD
👿 Mac Mini M2, Tahoe 26.5, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and 14 ❤️

𝑀𝓎 𝒢𝒶𝓁𝓁𝑒𝓇𝓎