This was my first thought as well. My email IS very important to me which is exactly why I will never host it locally. The only content I host locally-only is stuff I would be annoyed to lose but could replace, the only content I host locally with online backup is stuff I can do without for a couple of days while I recover. Email falls into neither of those categories, I need it to be up all the time. I have considered fastmail or similar but I will never trust my home connection.