If the upgrade was through the Duplicati GUI, then you should be able to use this process to downgrade. Note that not having worked with OMV yet the guide does not specific where you should expect to find the updates folder…
If the upgrade was through the Duplicati GUI, then you should be able to use this process to downgrade. Note that not having worked with OMV yet the guide does not specific where you should expect to find the updates folder…