Where am I backing up my iCloud to?

I have never used iTunes for my iPhone. I don't have iTunes on my computer. I do not know if that's where my data goes after I back up on iCloud. I have set up my iCloud account but I haven't backed up anything because I don't know where it ends up after its backed up and how I get my photos and contacts back when I get a new iPhone as my lock button does not work anymore and I can't relieve calls. Any information about iCloud and how it works. I've googled it, but can't seem to get the infoation I need.

Added (1). Information*

ICloud backs up your files to apples icloud servers and not any product that you own.

You can go to http://www.icloud.com/...icloud.com and it will show you what files you have backed up.

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