Is it possible to support google drive as storage engine?
I looked into this briefly one afternoon :)
It's similar to Dropbox, in that you create an 'app', register it, then just don't make it 'pubic'.
The docs are here:
And they have a Ruby API client (listed as 'alpha')
And an example Drive App written in ruby:
At the moment google drive support is not available in backup. The team is not currently working on adding new storage options themselves. A third-party PR would be required for this storage option to be added. I'll leave this issue open for now so people can more easily find it and contribute.