I’m afraid backups must be done before disaster, after is too late.
For photos, Are you sure you didn’t do ANY of these ways of preserving photos and videos?
- emailed, texted or messaged the photos to friends or family
- iCloud photo sync
- iCloud backup
- iTunes backup
- Transfer your photos to your computer via USB cable
- Apple Photo Stream
- Sync to Google Photos
- Sync to some other photo archiving service such as Shutterfly
- Sync to Dropbox
- Sync to box.com
- Sync to Microsoft OneDrive
- Sync to Amazon Photos
- back up to Livedrive
- Backup to any other backup or archiving service
If the answer is no to all of the above your photos are gone forever.