Model A binds the guest mount /mnt/<drive> directly onto the host's
<drive>/felhom-data namespace, so the guest mount already IS felhom-data.
The templates' ${HDD_PATH}/felhom-data/appdata/<app> therefore double-nested
to <drive>/felhom-data/felhom-data/appdata/<app> on disk, diverging from the
provenance-aware backup helpers (NamespaceRoot(drive,true) -> single-nested).
Change all four HDD app templates (romm, nextcloud, immich, paperless-ngx)
to ${HDD_PATH}/appdata/<app>, matching AppDataDir(NamespaceRoot(HDD_PATH,true)).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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