Tech Support Alert is an excellent unbiased (they don't sell anything) source of tech stuff. They have revised their rankings of free online backup and rated iDrive as the best. It gives you 5 GB free which is as much or more than anyone, is a snap to set-up (it takes a couple of minutes at most), and is fully automatic and customizable.
iDrive Download Link: https://www.idrive.com/index.html
Tech Support Alert Review Link: http://www.techsupportalert.com/content/best-free-online-backup-sites.htm