Step 1:

Connect iPhone to system after installing the iphone backup software. The software will automatically detect it and will show the list of file from the iPhone 

Step 2:

Choose the files you want to take backup and click on export button.

Step 3:

After you click Export button, the under given window will pop up, you can choose either backup to computer or itunes directly. You can set the output folder at Advanced->Options before you transfer

Step 4:

When backup is finished a window will pop up displaying message as 'export finished' after which you can see it from the location stored in.