How to retrieve photos from older iCloud backup iPhone 5

Old iPhone 5 replaced by new iPhone 5. Backed up to iCloud from old one. Apple Store failed to tell me about autobackup every 24 hours at 2:47. Consequently my good backup file was over written (over 1,000 pictures). Are there any gyrations to go through to recapture this very important iCloud backup file with a prior than current date?

How do I know my operating system? This thing was new yesterday 6/30/15.