After downloading PhoneRescue and installing it to computer, you can easily extract your wanted data from iPhone backup on your Mac and PC by following the steps below. 1  Step 1. Open PhoneRescue > Select Recover from iTunes Backup > Click on Right Arrow to enter the next page. Step 2. Select the backup that contains the data you need > Click on Right Arrow to scan the backup. Step 3. Preview and select the data you need > Click on To Computer button.