Agreed. Another compelling reason is data deletion -- accidental or malicious. While catastrophic loss due to hardware seems to have declined over the past few years, malicious deletion has gone up markedly.

I've pimped them out before, but this is why I set up backupify (handle more than just gmail, since your Google password is for all your Google accounts) and periodically export my data. I just wish they did more, like backup my Dropbox and Atlassian accounts.