systemd · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/systemd/system/mnt-backup.automount so /mnt/backup is mounted on first access and unmounted when idle. Include an [Automount] section with Where=/mnt/backup and TimeoutIdleSec=120, plus an [Install] section with WantedBy=multi-user.target. (A matching mnt-backup.mount provides the actual mount.) (Authored config, graded structurally — the engine isn't run here.)
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