Latest version borks on root drive path specification. Though similar to https://forum.duplicati.com/t/newest-version-network-folders-not-working/, my drives are local.
From the logs:
Fatal error => Invalid path: E:\ Parameter name: path
Skipped (nay, narrowly avoided) the v2.0.4.13 update so last successful backup was on v2.0.4.12 yesterday.