many thanks for your answer! Unfortunately custom scripts are also executed on the Veeam server and not inside the VM, as it's done for example for pre-freeze- and post-thaw-scripts. But we've found a PS module which provides SSH capabilities, so we're now developing PS scripts which will hopefully do the job.
As soon as we're having some working scripts (or given up,
) I will update this thread and post our experiences with this approach.
Best regards from Germany,