The main thing which protects them is size. Roll a neodynium magnet around a laptop or cell phone and it's already experienced a far larger magnetic field chang

The main thing which protects them is size. Roll a neodynium magnet around a laptop or cell phone and it's already experienced a far larger magnetic field change than will ever appear due to a solar flare. The earth's magnetic field holds immensly more energy than the magnet but it's so extremely diffuse it will only effectively couple into massive-scale structures.