IPhone iCloud backup not working

My iPhone 4 is backed up onto iCloud on iTunes. It has never gave me any problems before, but currently my ICloud won't back up my data. It has a error code that there's not enough space on my iPhone, should I reset it to factory mode and try restoring it?

ICloud normally only gives you 5 gb of storage and of you want more you have to pay for it… See if there's anything on here but if you want more storage you need to buy it
http://www.apple.com/...om/icloud/

You just have to manage your storage settings.

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