I use a cronjob that uses duplicity for encrypted backups with Google Drive as external storage (python2-gdata package on Arch). After Google dropped their price on 100GB to $2/month they became the cheapest option for me.
I'd love to use something like Tarsnap, but storing my ~80GB of data with them would cost $24/month plus $0.30 per gigabyte of bandwidth. And rsync.net is $0.10 per GB of storage, so that would be $8/month. (that price only when signing up through git-annex http://www.rsync.net/products/git-annex-pricing.html )
I'd love to use something like Tarsnap, but storing my ~80GB of data with them would cost $24/month plus $0.30 per gigabyte of bandwidth. And rsync.net is $0.10 per GB of storage, so that would be $8/month. (that price only when signing up through git-annex http://www.rsync.net/products/git-annex-pricing.html )