Contact back up question

I use a clone for a backup of my entire hard drive. I also keep all my
contacts in the cloud so obviously I don't have a back up of my
contacts. So is a simple "File/Export/Contacts Archive" the best
solution. If so should the vCard formate be 3.0?
Then when I update my clone the vCard file would be backed up. Clone is
on a removable HD using SuperDuper.