Maybe with low priority. Samba is running as standard Linux process. So not linked to OMV. Maybe it is easier to find why my standard myuser stopped having access to shares (windows enter credentials for shares). Only after I add myuser to root group myuser can access shares again. And thinking back. It could well be that my rsync job did write. Not really files but it may have updated ownerships and access rights. This would mean some of the Linux system files changed owneship/access right. How can I find out what is the right settings for debian files? Saying that reinstalling OMV wouldn't help if it is really a messed up debian.