What should we do about an ice dam on our roof?

Just before Christmas our dining room ceiling suddenly began to leak. Our house is a tri-level and the leak was below the area where the two roofs meet. Like much of the nation we are currently experiencing extreme cold and snow. My fear is that when temperatures begin to warm it will happen again. What is the proper response:
  • Now: Is there a proper way to address the snow-covered roof?
  • Later: before we pursue ceiling repair, what should be done in the attic (replace wet insulation, etc)?
  • Is there away to prevent future damage and should the work be done by professionals?
Thank you.

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