In my case, as I'm running Windows, I connect pocket drive at the moment of the backup, I launch a batch that uses Robocopy, an insanely robust command-line tool provided by Microsoft (it exists since Windows NT3.5 at least) to make a real hierarchical copy of my Poser stuff, and when it's done: I disconnect the pocket drive and put it in a safe place.
They're changed every 2-3 years, independently of their current state.

𝒫𝒽𝓎𝓁

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👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sonoma 14.6.1, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️