velero backup create <backup-name> --exclude-namespaces=tkg-system,velero --include-cluster-resources=true --ttl 365000h
rpc error: code = Unknown desc = Resource CRD certificates.cert-manager.io is blocked, skipping" error.file="/go/src/github.com/vmware-tanzu/velero/pkg/backup/item_backupper.go:331"
There is currently no fix to include restricted resources in backup.
You can work around this issue by excluding cert-manager resources
velero backup create <backup-name> --exclude-namespaces=tkg-system,velero --include-cluster-resources=true --ttl 365000h --exclude-resources certificaterequests.cert-manager.io,issuers.cert-manager.io,certificates.cert-manager.io