A.M Contacts Backup is a simple user-friendly app for backing up and restoring contacts on the fly. The contacts are backed up in Vcard format, which works with other mobile phones and Macs as well. You can even upload your backup files to Dropbox, G.Drive or mail them to yourself. The app has iTunes file sharing feature as well, so you can add your own Vcard files and the app will restore contacts from them for you.

*Back Contacts up with "Backup All" or "Backup Selected" options.
*Restore Contacts from backup (.vcf) Vcard files. You can even add your own Vcard(.vcf) files through iTunes File sharing which the app will detect automatically.
*Upload backup files to Dropbox, or mail them to yourself, or upload to G.Drive, or maybe all three!.