Easy solution: no iTunes needed, no Apple ID restriction!.
Airdrop to back up contacts without iTunes.
Enable iCloud to back up iPhone contacts without iTunes.
What's worse, if you want to transfer contacts to a new iPhone, you can count on nothing but restore the full backup to your new iPhone, that means overwrites other files such as photos, videos and songs. But the problem is, you cannot extract a single contact from your backup file. If you want to encrypt your contacts card using iTunes, the only way is to perform a full backup and enable the encryption option.
iTunes cannot selectively restore some contacts from a backup.
After syncing contacts with Windows or Mac address book, you will find your entire contacts card accessible and editable to everyone using this computer. The need to password-protect personal data on iPhone is not sufficiently addressed on iTunes front, especially when you are sharing your desktop with other people.
iTunes cannot encrypt contacts unless you do a full backup.
But sometimes, iTunes mistakenly synchronizes an empty address book from computer to your iPhone, wiping out all the contacts on your iPhone. Usually, when you go to info panel to sync contacts with Windows or Mac address book, your contacts info go from an iPhone to a computer. It's nothing new to hear people complaining iTunes erase their data from iPhone, which to an extent has made clicking the sync button a nuclear operation.
iTunes may wipe out your contacts when syncing goes in a wrong direction.
Why we don't love iTunes? Apart from iTunes not recognize iPhone and annoying iTunes errors that drives us nuts, this tool is not flexible enough with regards to contacts backup: If you are searching for an easy solutsion, jump here: The solution most recommended by us