Hello, Tracey.
Thank you for the question. The articles below will help you manage your iCloud storage and give you direction on what is backed up as well as what modifications you can make to get under the allotted storage quota. Normally what I see when it comes to backup issue are related to photos and videos on the device. I see from your post that Photo Stream is not enabled. Since this is the case, all photos and videos are part of your backup file. When using Photo Stream, photos take after the time of being enabled will be uploaded and not count towards you allotted storage. Videos will always be part of your backup file. That being said, see the section labeled Reducing the size of your Camera Roll backup under Backup.
iCloud: Backup and restore overview
http://support.apple.com/kb/HT4859
iCloud: Managing your iCloud storage
http://support.apple.com/kb/ht4847
Also, if you share your Apple ID with another person, this takes away from your allotted storage quota as well.
Cheers,
Jason H.