How to Back Up Photos From the iPhone
Backing up your iPhone photos ensures you have copies of all of your photos in the event that your iPhone fails. Without a backup, your iPhone could become wet, broken or otherwise malfunction, therefore causing you to lose all of the media, information and files saved on the device. Backing up is easily done through iTunes and it permanently saves a copy of each picture to iTunes so you can access the files later, should your iPhone ever malfunction.
Connect your iPhone to your computer by plugging the long, flat end of the supplied adapter into the bottom of the phone and the smaller, thicker end into a USB port on your computer.
Load iTunes if it doesn't load automatically by double clicking the iTunes icon from your desktop. If you have not yet downloaded the iTunes software, visit itunes.com to do so. You'll need the software in order to download music and videos, sync your device and backup your files.
Right-click the device from the left side panel in iTunes. When the menu appears, select "Back Up." iTunes will then create a backup of the file that you can restore to your iPhone should added software or updates disrupt your phone's functionality.
Click "Start" from the Windows menu, then select "My Computer." Find your iPhone listed as a hard drive in your computer. Note that your computer may recognize your phone as a camera. Double-click to open the iPhone files. You'll notice that all your photos are saved as JPEGs on your iPhone
Select all the photos from your iPhone by clicking above the start of the list, then dragging your mouse downward with the button still depressed to the bottom of the list. Right-click on top of the highlighted list and select "Save in My Pictures." This will save a copy of the picture to your picture file for future use.