To uninstall Hornetsecurity VM Backup 9.0 and newer from Windows Server Core editions, simply open command prompt and type the command removevmb and hit enter.

To uninstall Altaro VM Backup 4.0 and newer from Windows Server Core editions, simply open command prompt and type the command removealtaro and hit enter.

To uninstall Altaro VM Backup 3.5 and older from Windows Server Core editions, run the following installer and choose "Uninstall" from the options:

C:\Program Files\Altaro\Altaro Hyper-V Backup\backup2.msi