From the log output, it looks like it's finding DST_DATASTORE: mini-local-datastore-2 which is most likely not your datastore as that is just a default I have in the ghettoVCB.sh script which means you're probably not setting it correctly.
If you take a look at the ghettoVCB documentation, the VM_BACKUP_VOLUME should be defined as /vmfs/volumes/<some-datastore-name>/<some-backup-directory> like /vmfs/volumes/datastore1/mybackups for example (no need to specify the UUID of the datastore, human readable name works) ... why do you have a -g option? Remove the -g option and set the variable like
VM_BACKUP_VOLUME=/vmfs/volumes/DataStore2/backups