David,
Thanks for the quick reply. I created a new project and followed the steps correctly (at least as far as I can see). I use your plugin on numerous sites, but this is the only one with 2 sites backing up to the same Google Drive account. I have many sites backing up to Dropbox and no problems there. The full error is:
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No refresh token was received from Google. This often means that you entered your client secret wrongly, or that you have not yet re-authenticated (below) since correcting it. Re-check it, then follow the link to authenticate again. Finally, if that does not work, then use expert mode to wipe all your settings, create a new Google client ID/secret, and start again. Error: invalid_client
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I also, after a few tries and double checking, did wipe the settings clean and started again - even created a new project again, but got the same results. I definitely am not entering anything wrong, so that shouldn't be the issue.
I've spent a few hours on this, double checking and researching online. Not sure if I should give up at this point and look for another Google Drive backup plugin, although I really like Updraft. !