We will be using Contacts backup to pdf, excel app on App Store to backup iPhone contacts as PDF, EXCEL, XLSX, HTML, TEXT. You can download this app from here.
- Open app. A message will popup asking for contacts access. Allow access to backup all contacts from your iPhone/iPad
- After allowing full access click on the right arrow and select the format you want to export the backup as
Download the app from here. You can also restore the backup from the iCloud backup section.