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Re-adjudicates F4: /backup/restore, /backup/tier2/restore, /backup/offbox/restore blocked the HTTP request until completion, so through cloudflared's 100s cap a customer got an error page while the restore succeeded (offbox worse — bounded on r.Context(), canceling the SFTP restore mid-flight). Convert all three to the offboxRun async shape: fast-path IsRunning refuse, background goroutine (offbox ctx off r.Context() -> Background+30m), instant redirect. Add mutex- guarded op-status (opstatus.go) + GET /api/backup/restore-status + a 3s-polling backups.html banner (neutral running, red on failure). Restore single-flight unchanged. Tests + red-proof (sync handler blocks indefinitely vs <500ms async). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6