Don't make doctors guess about your medical history
In 2015, a National Post article estimated that medical errors are responsible for more than 35,000 deaths in Canada every year. At least 30% of them could have been prevented had the medical record been present and available.
Proactive and Preventative
You proactively maintain files on your taxes, your mortgage, your insurance, your automobile, your children, etc. It makes sense to retain your personal health records among your critically important files.