Someone should write a program to consolidate multiple cloud file storage services into one simple interface with as much free space as you can get. So, if you end up with a little extra space on Dropbox and some on SkyDrive, Google Drive and other services, all you need to do is add a plugin to your file sync manager, tell it your credentials, and its space is added to your pool. Then you set up sync folders and the tool decides where in which service those files should go. It would only be a stopgap solution, really, to make use of little bits of online storage together in one clean app, but it does seem like a useful thing for some people.
Mokalus of Borg
PS - On desktops and servers, that's called "RAID".
PPS - In this implementation, it would just be working on cloud services instead of physical disks.