Simple way to maintain your own data in a similar way would be using a Synology NAS unit at home and using their "Cloud Station." Not as simple as Dropbox, but I maintain 100% ownership. That said, I do still use Dropbox.

Google's solution sounds interesting, but I also noticed they increased cost of additional storage a lot. I bought extra storage for Picasa a while back. It was $5 annually for 20GB of storage. Now 25GB is $2.49/mo.