I use
Carbonite for the bulk of my online storage, but I do keep some frequently accessed files in OneDrive (formerly SkyDrive until the name infringement lawsuit) as well as a few in iCloud. Carbonite has been a lifesaver. When my last PC went belly-up, transferring the saved files to the new PC was a breeze. Another plus is the ability to access the files via my iPad. Not so big a plus now that I'm retired and have constant access now to my PC, but it sure came in handy when I was at work and needed a file from my home PC.