see this support article:
The following items are not backed up to iCloud. You can sync these items with a computer using iTunes:
- Music, movies and TV shows not purchased from the iTunes Store
- Podcasts and audio books
- Photos that were originally synced from your computer
So the iCloud backup will contain all images in the camera roll, but not albums originally synched from your computer. To store and backup photos on your mobile devices add them to the Camera Roll.
You might also wish to look at: iCloud: Troubleshooting restore issues with iCloud Backup