This is a hot market -- the likes of CTERA Networks Ltd., Emulex Corp., Nirvanix Inc., and Riverbed Technology among others. EMC bought TwinStrata earlier this year and Iron Mountain has its own gateway. The idea is to have an appliance that sits on your enterprise network, and takes the file traffic and turns this into block storage and sends to your cloud account.
The block traffic is more efficient across the wide-area Internet links, so you save time and get a faster backup completion.
These products have been out for several years now, and have become more capable and efficient at working with the various back and disaster recovery software tools too.