Help! I lost my contacts after iCloud Backup...

I was backing up my iPhone's Contacts, Calendars, Passbook, Photo Stream, Documents & Data and Find My iPhone on iCloud.

Everything worked out except for my Contacts — I lost them.

I always used the "Back up to this computer" option on my mac — but I don't know how to acces this backup or if it even has my Contacts.

Help...! : /