I tried the MS Skydrive, and the free cloud space I get w/Comcast. Actually I guess I do use it for my Kindle Fire, but only for a few non-personal things like a book or two and one or two games. The other two are painstakingly slow to upload to, and Skydrive is much more awkward to use than it should be. I have a very fast download speed, but uploads are simply too slow. Then there are security and reliability considerations. When I can buy a 2 TB hard drive for just over $100, it's not at all obvious why anyone would want to use this abomination. As for backup, I can do that to an external hard drive, and put a copy on a flash drive locked up in my car (which has a security system). I have on occasion put some data in my safe deposit box, but that's really overkill for me.
Hoarding photos on your phone?
Those picture are hogging memory and could be slowing down your phone.