Any chance you could build S3 support into Gmvault? So you could cron it on a linux box to connect to Google and push all the data into an S3 bucket? If money is an issue, I'd be interested in footing the bill.
This is something I have in mind: Cloud save.
It will be added in the roadmap.
Please contact me and I will keep you in the loop.
Regarding the money I am thinking of adding a donate button to support the project.