Rsync.net has direct SFTP and rsync for $0.03/GB/month:
http://rsync.net/products/attic.htmlAnd with the quality of service I expect from a service hosted on a Comcast connection, I'd say you're roughly comparable in reliability/quality to low end VPS providers like https://www.time4vps.eu/. From them you can get a 40GB VM for $2.35/mo.