Part 3 - Archiving Your Contacts Data
As for the Contacts app, the procedure for archiving its data is practically identical. Go to File > Export > Contacts Archive.
Each of the apps discussed can create their own archive files
You will be prompted to name the .abbu file. This is an Apple-proprietary Address Book Back Up file. On an American english system, the suggested file name will follow the format: “Contacts - mm-dd-yyyy.abbu” which you can modify if you wish, but don't change the extension.
As an aside, the other export option under File > Export in Contacts, is to export your individual or multiple contacts as a vCard or .vcf file. This is a Virtual Business Card file format used to transfer or exchange contacts data among many platforms and applications.
Next: Archiving is Half the Story – Learn How to Restore Your Data