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offbox located each toggled app's recovery unit via AppNamespaceRoot→GetAppDrivePath, which reads the app's LIVE app.yaml HDD_PATH and silently falls back to systemDataPath when the app isn't deployed → looked on the wrong drive, backed up nothing, reported ok/0 (DIAG root cause). Now: - discoverOffboxUnit/offboxCandidateNSRoots scan the durable storage registry (schedulable non-decommissioned paths ∪ systemDataPath) for backups/primary/<app>, independent of deploy state; newest-by-manifest-CreatedAt wins on drive churn. - RunOffboxBackup: runOffboxInternal returns (backedUp, missing, err); 0-of-N toggled → hard error + operator alert; partial → ok + new OffboxTarget.LastWarning (shown on /backups, preserved across config edit). - AppNamespaceRoot + primary WRITE paths unchanged. - 6 non-hollow tests (A-E + edge) + both companion red-proofs run (reverted). - NOT yet live-validated against the Storage Box (spike creds torn down). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6