Losing iPhone voice memos, call history or calendars happens unexpectedly, maybe your iPhone is stolen, broken, formatted, and so on. But if you've made a backup in iTunes before, we can still recover them by extracting from iTunes backup file. And we need an iPhone Backup Extractor to help!
Remember don't connect your iPhone to computer with iTunes right now, or the iPhone backup file would be updated.
Guide: how to restore iPhone voice memos from itunes backup
Step 1: Select Backup Device
Launch the app on computer, then the app will detect all of the devices that you've backed on this computer before. Just slect your device, and click "Start Scan".
Step 2: Recover Voice Memos from iPhone backup
Go to "voice memos", select and check those you need to recover, and click "Recover" to start the recovery.
OK, that's all! Just recover call history, calendar and Notes in the same way.