This is a big deal Aussie website, hosted by rackspace.

I enquired with rackspace, and this is the conversation

… oops …. glad its not my website.

They probably do have good uptime, but no-one is perfect.

You need to have plans around a supplier outage, and also have plans to move to another provider in the case of too many outages.

Here is their status page also – looks like it been a problem for a few days, and the outage is currently most of a day …. ooops !!!