

RAID is carrying a spare tire in your car. Backups are like having an extra car in the garage in case your primary geta totaled.
It’s possible you’ll never need either one, but if you pop a flat, a whole extra car is overkill.
It’s not a perfect metaphor, since most people don’t have a spare car.
Check out Immich next. It’s sort of like a self-hosted Google photos except it allows you to own your photos.