I use Backupify to at least maintain a copy of everything with a second, separate service, just in case. It's free at my volumes, and I think a prudent idea for those of us with everything in "the cloud".
It's kind of hilarious and sad that, judging by their home page, it's possible to build a business on selling "In Case Google Stabs You In The Face" insurance.
I've been using them since their beta. While I haven't had need to download any of the backups, I'm grateful to know that if something were to happen I won't have lost access to my data.
