Excellent
Backup and restore contacts in multi formats via email, Dropbox, and direct to computer via wifi, find and delete duplicates, even backs up contact notes, something most other apps dont do. Its fast too.
(To backup your contacts to Dropbox, after doing your backup, go to Settings and click on the green In App Vcard Restore button. A list will pop up and you can select your desired location from there.)
5 Stars well deserved.
cpthngr about
My Contacts Backup Pro, v1.5.1