This is an important point. Not only should your online services have an easy way for you to get data out of them, but you probably should have a reasonably sane backup schedule, just like you would for hard drives/physical media/etc.

That being said this is a very short amount of time, and hopefully future shutdowns like this at yahoo and other places give more of a warning.

Yahoo engineers may have verified that none of the users of these products have a vacation scheduled in Yahoo Calendar, which will presumably be the last property to shut down, for this reason.