Failed to backup to Google Drive after couple of months

[JonMikelV]

It sounds like you’re not the only one:

GDrive backend `TrustFailure` (even with `accept-any-ssl-certificate`)

Greetings. I am encountering trouble with my remote backups, using Duplicati version 2.0.2.1 under Ubuntu 17.10. It seems like the problems started a few days ago after I updated from 17.04. Performing a backup using an existing configuration with Google Drive backend fails at the beginning of the procedure with the following error Duplicati.Library.Interface.UserInformationException: Failed to authorize using the OAuth service: Error: TrustFailure (The authentication or decryption has failed.)…

One time this error was reported (though not with Google Drive) here’s what @kenkendk had to say:

Amazon Cloud Drive - Web UI Hangs on 'Test connection'

It sounds like there is some connection issue between your machine and the OAuth server. I assume you can open https://duplicati-oauth-handler.appspot.com in a browser from the same machine. There is this issue, which indicates that sometimes the connections fail, but I am not sure it is related to your issue, as you get no reply (timeout):