The ISS is still within the Earth’s magnetic field. The only people who have been outside were Apollo astronauts, and only for a short time.
Yup, the long term ISS missions proved that with considerable effort, you can survive in microgravity that long.
IIRC, one of the Apollo missions was shortly followed by solar flare that would have killed them.
The most dangerous radiation any interplanetary astronaut will face is gamma radiation, which is not affected by magnetic fields.