Update to Duplicati - 2.0.4.8_canary_2018-12-13 seemed to go ok and subsequent backups completed successfully, but looking in the Server stored log I see
24 Dec 2018 12:47: Error in updater
System.IO.InvalidDataException: Unable to verify signature
at Duplicati.Library.AutoUpdater.SignatureReadingStream…ctor(Stream stream, RSACryptoServiceProvider key)
at Duplicati.Library.AutoUpdater.UpdaterManager.CheckForUpdate(ReleaseType channel)
24 Dec 2018 12:47: Error in updater
System.Net.WebException: The remote name could not be resolved: ‘alt.updates.duplicati.com’
at System.Net.WebClient.DownloadFile(Uri address, String fileName)
at Duplicati.Library.AutoUpdater.UpdaterManager.CheckForUpdate(ReleaseType channel)
while all the live log levels rather than “disabled” have disappeared.