The backflow current from fans is extremely minuscule and extremely unlikely to damage anything from that. There are even tests using a damn leaf blower on the fans and it barely generated any current. Even if it did generate a backflow, diodes on the mobo should prevent it from becoming an issue unless it’s a power so great that it just fries everything, but that’s basically impossible with a fan.
The backflow current from fans is extremely minuscule and extremely unlikely to damage anything from that. There are even tests using a damn leaf blower on the fans and it barely generated any current. Even if it did generate a backflow, diodes on the mobo should prevent it from becoming an issue unless it’s a power so great that it just fries everything, but that’s basically impossible with a fan.
Here’s one such experiment.
https://youtu.be/k9KA-xLLQXo