It was edited after I posted.
I have an iPad 2 and iPhone 4S backing up to iCloud and I haven't even used 500 MBs. Still have 4.5 GBs free.
That's what I said in my original post.
Don't get this. I have my iPad 2 and 4S both backed up to iCloud and I am using a total of over 4 GB.....3 GB for the iPad and 1 for the 4S. Why would there be that much difference? Both of mine are 16 GB, with 9 GB available on the iPhone and 7.7 GB available on the Ipad.