It's 2011, seemingly "the year of Social". We have Facetime, Google+ Hangouts/Huddles, Facebook video chat, Twitter and iMessage built into iOS, Messenger built into WP7. It sounds like we're making great progress in improving the way we can communicate with our friends. Super!
When I set my Mac Mini for iPhone development, I was told to backup a key file (.p12) because if I lost it and needed to reinstall, I wouldn't be able to deploy to my iPhone (yikes!). I backed it up as suggested, and made sure I had copies of it all over my Mac, PC and the interwebs.