Permissions and group:owner levels for /mnt/raid5

I have a Ubuntu 16.04 with hardware raid5 which is at /mtn/raid5.
Are my group:owner and permissions levels set properly for security?

Owncloud Data Location



Doesn’t look bad. As root you can impersonate a different user and check if this user has access to it:

sudo -u nobody ls -lisa /mnt/raid5/owncloud/data/owncloud/files/Photos


sudo -u nobody touch /mnt/raid5/owncloud/data/owncloud/files/Photos/test.txt

Permission denied in both cases.