Déjà Dup does not allow to change google drive account from which restore the files
I just had this problem with choosing the account and this is how I solved it (with a workaround):
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Go to Google Drive
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Click on "Settings" in the top right corner
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Go to "Manage apps"
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Remove access by Déjà Dup Backups (I also removed access by GNOME earlier, but it didn't fix anything and based on what I read it shouldn't change anything, but I'm just putting it out there)
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Try backing up or restoring with deja-dup again and now it will ask for you to choose and account.