After upgrading to OES2018 SP2 I noticed, that smdr crashes, if one tries to authenticate. So backup of Edir and NSS volumes via TSAs not working.
I have already a SR open on this issue, which seems to be a known one. According to support they are working with high priority on this problem.
I have switched to backup the virtual disks, on the Vmware hypervisor level, but would prefer to switch back to the smdr file level backup to allow restore at that level.