Hi Rob,
The critical line is the one before:
0001.055 (0) Error message: SSL certificate problem: unable to get local issuer certificate
I've spotted an issue which could affect one of the SSL settings on Google Drive. Please de-install UD, then re-install with the developer version:
http://downloads.wordpress.org/plugin/updraftplus.zip
Then:
- Make sure that the option "Use the server's SSL certificates:" in the 'Expert' section is ON.
- Then save settings.
- Then re-authorise (click on the authorisation link in the Google Drive settings section on the UD settings page).
Then I'm hopeful that may fix it.
2-factor auth is not a problem. I use it myself.
David