i would grab the entire config, you can always pick out the zones out of that and import them. Another klunky option is to run:  sh zones > bootflash:zones.txt copy bootflash:zones.txt tftp://blah blah blah  Upgrade to DCNM, it has the same "Fabric Manager" like functionality.
Any suggestions on how to backup zones on a Cisco MDS-9148 from the CLI? I have done it for years from the Cisco Fabric Manager GUI, but that product seems to be end of life now.
MDS-9148 Zone Backup