Shit happens. It was also possible if all your data was on the hard drive. And Google drive has an offline version of the app, so server downtimes limit the usage but don't make it completely useless. And if my hard drive breaks, it's not like a bunch of very well paid engineers are working relentlessly to bring my hard drive back as quickly as possible. But they are in case of a services like dropbox or drive. And not to mention that the whole backup work is being taken care of.