You're welcome. Also, if you don't want to delete all the duplicates manually, there My Contacts Backup Pro version of the app will locate and delete duplicates for you if you want to use it. If you go this route, just delete the free version as you won't need both.
Even though you may be backing up to iCloud I recommend that you still do occasional manual backups on your computer using iTunes by right-clicking on the name of your phone and selecting Back Up (I do this at least weekly). This way you will always have a second backup in case the iCloud backup ever fails (which they unfortunately have been known to do). It also allows you to include the backup in your computer backup, assuming you're using Time Machine.
Music is not included in the iPhone backup. Music purchased from the iTunes store is available for redownloading for free should you ever need to (assuming the songs are still available), but music from other sources is not. It should all be in your iTunes library, and it's a good practice to include it in your computer backup.