Windows Server 2019 has been started to be supported since Asigra DS-Client v14.1 hotfix 8:
Windows DS-Client Hotfix 8 (14.1.0.8) or later:

  • Windows Server 2019 (BMR file system)
  • Microsoft Exchange Server 2019
  • Microsoft Hyper-V Server 2019
  • Microsoft Outlook 2019
  • Microsoft SharePoint Server 2019