Contacts Backup
suggestions;
1.make sure to make a backup to your storage card before you canupload it to your drive,gmail or dropbox.
2.before restoring contacts delete all your contacts in the deviceit is a good way to avoid duplication.
3.app saves your contacts as a vcf file(contacts.vcf).
4.some lower versions of android require sd card .

Backup
This app will allow you to backup your contacts onto SD card,Google drive, and Dropbox. You can also email the VCF files.
Restore
It will also allow you to restore all your contacts to yourdevice.
Adding/Deleting
You can add and delete your contacts through the app. You will beable to see all your contacts in the list view.