The title is, I think, a bit misleading. That's because it is not Android per se that is sending your wifi passwords to the cloud, it's the use of the "backup

The title is, I think, a bit misleading. That's because it is not Android per se that is sending your wifi passwords to the cloud, it's the use of the "backup my data" tool. If you're interested in robust, secure storage of your data, the candy-flavored OS built-in-cloud-tool may not be your best bet. It's only there to check a feature box on a sales card. "Oooh but I get 5 gigs for free!"