Do you provide your own internet bandwidth? You have to rely on external providers at some point and in all likelihood Google is better at keeping the lights on than you are.
I've never really understood that argument. Assuming that your site is totally down when your server goes down and that you rely on jquery so heavily that loosing it essentially renders your site unusable it doesn't seem to matter how much better google is at delivering content than you are. If you can manage an uptime greater than 50% the likelihood is that your server and google will be down at different times so the downtime is additive.
I think the argument is that google is an order of magnitude or so better at downtime than you are, so any google-created downtime is lost in the noise.
True, Google is probably better at keeping their servers up... but I prefer to reduce my external dependencies anyway.
Right now, I only have to rely on my hosting partner - which means I'm dependent on just ONE party. If something goes wrong, I call 'em and kick their lazy asses :) Chances are that things are up and running in no time.
Remember when Amazon's cloud storage went offline last July? This meant all kinds of websites relying on that service were offline as well. No-one knew what was happening, why it was happening, and when it would be back online. I don't need that - seriously :)
