Give an informative error if fsGroup is not define when trying to setup backup

When I try to follow the 2.6.0 documentation for enabling backup, I'm seeing the following errors:

kubectl logs pods/my-backup-full-bk2vh

Traceback (most recent call last):

  File "/usr/local/bin/backup.py", line 1243, in <module>

    Backup(context).run()

  File "/usr/local/bin/backup.py", line 379, in run

    self._setup_logging()

  File "/usr/local/bin/backup.py", line 1151, in _setup_logging

    os.makedirs(self.context.log_path, exist_ok=True)

  File "/usr/lib/python3.8/os.py", line 223, in makedirs

    mkdir(name, mode)

PermissionError: [Errno 13] Permission denied: '/data/scriptlogs' 

Steps:
1) bin/cao create backup

2) Enable automatic backup

apiVersion: couchbase/v2
kind: CouchbaseCluster
spec:
backup:
managed: true
image: couchbase/operator-backup:1.3.2
serviceAccountName: couchbase-backup

3) Create a yaml with an immediate backup

apiVersion: couchbase.com/v2
kind: CouchbaseBackup
metadata:
name: my-backup
spec:
strategy: immediate_full
size: 20Gi

Justin Ashworth