Comment 13 for bug 1641423

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Michael Terry (mterry) wrote : Re: Back up failed with message: Failed to execute child process "duplicity" (No such file or directory)

Try making sure deja-dup-backend-gvfs is installed. That should be installed by the GUI when you first open Deja Dup preferences and click the Install button. But I think Deja Dup is confused in your case.