What are the odds that Dropbox and HN and a dozen popular internet memes of your choice and your local computer and your phone and your blog and… …go all down

What are the odds that Dropbox and HN and a dozen popular internet memes of your choice and your local computer and your phone and your blog and… …go all down before you can react? Seriously, if you need a secure backup, a couple instances, geographically separated, are more than enough.