What contributes to my iPhone iCloud backup size? Settings lists my phone's iCloud "Backup Size" as 2.2 GB (excluding other phones and general "Documents &amp; Data") though all of its apps turned "on" for backup below don't even approach 0.5 GB when summed. What else is contributing to this unexpectedly large number, and how can I reduce them?
Per Apple, this is what is backed up:


Purchased music, movies, TV shows, apps, and books
Photos and videos in your Camera Roll
Device settings
App data
Home screen and app organization
iMessage, text (SMS), and MMS messages
Ringtones
Visual Voicemail


Things like purchased content, Messages.app, ringtones, and voicemails are not actually explicitly listed in the backup screens for you to see how much space will be used. This would account for the difference.