Hi MG,
I have been looking for the same thing and tried the Google drive upgrade but found it to be unuseably slow! I have lots of RAW files and videos, as well as work docs, and I use free dropbox for my work docs, and now use Amazon S3 for the 90GB of images etc. They have also now brought out Amazon Glacier, which is slower to retrieve in the event you ever need to, but is crazy cheap. I think Ill be about $3 a month or something. Glacier was limited initially, because you had limited support of clients that could move the data from S3 to Glacier, it was more just published APIs. But now a lot seem to support it, and it seems easier. Once transfered from S3 to Glacier, just delete the S3 files and you are down to Glacier storage only. I think they will be allowing direct Glacier upload soon also which should make it easier.