https://docs.openshift.com/container-platform/4.8/backup_and_restore/application_backup_and_restore/troubleshooting.html#oadp-debugging-oc-cli_oadp-troubleshooting
before the steps mentioned after subheading "Velero pod debug logs" can proceed, the following prerequisites are required.

• Edit replica of openshift-adp-controller-manager deployment to 0 inside OADP ClusterServiceVersion
  You can do this from web interface by going to OpenShift Web Console Administrator view > Operators > Installed Operators > namespace > OADP Operator > YAML
  which is equivalent to navigating to <openshift-web-console>/k8s/ns/openshift-adp/operators.coreos.com~v1alpha1~ClusterServiceVersion/oadp-operator.v1.0.2/yaml (example link for oadp-operator version v1.0.2)
  
  You can do change the replica to 0 in CLI with

  oc patch $(oc get csv -n openshift-adp -oname | grep oadp) -n openshift-adp --patch '[{"op": "replace", "path": "/spec/install/spec/deployments/0/spec/replicas", "value": 0 }]' --type=json

If you need OADP Operator to process your DataProtectionApplication again set replicas back to 1.

oc patch $(oc get csv -n openshift-adp -oname | grep oadp) -n openshift-adp --patch '[{"op": "replace", "path": "/spec/install/spec/deployments/0/spec/replicas", "value": 1 }]' --type=json