I want to timer a simple backup of part of my system with rsync. The partition I want to use for backup is on an external USB drive. For safety reasons (avoid any accidental erase), I want the partition be mounted only for the time of the rsync, then be umounted Here is my setup: /etc/fstab ----------------- UUID=868560c1-ab69-423f-b76d-b8ea5af1b066 /mnt/backup ext2 noauto,x-systemd.automount,x-systemd.device-timeout=5,x-systemd.idle-timeout=60 0 2 ----------------------- /etc/systemd/system/backup-external.service ---------------------------------------------------- [Unit] Description=Backup system to external drive Requires=mnt-backup.mount After=mnt-backup.mount [Service] Type=oneshot ExecStart=/usr/bin/rsync -av --delete --exclude-from /etc/conf.d/exclude-hortensia / /mnt/backup/hortensia ExecStartPost=/usr/bin/umount /mnt/backup ------------------------------------------------------------------------- /etc/systemd/system/backup-external.timer ------------------------------------------ [Unit] Description=Start external-backup service periodically [Timer] OnCalendar=Mon *-*-* 00:00:00 Persistent=True [Install] WantedBy=timers.target --------------------------------------------------- $ ls /run/systemd/generator ..... mnt-backup.automount mnt-backup.mount --------------------------------- The setup works BUT in fact /mnt/backup/hortensia is always mounted, even after boot, and I want to avoid it.(maybe because it is USB and autmounted like any USB device?) What surprised me is if I run: # umount /mnt/backup I come back to command with no text BUT /dev/dev/mapper/vg1-backup_hortensia (my backup partition) is still mounted. Furthermore, I can mount/umount it elsewhere (mnt/toto for example). I can't see what is wrong and how can I achieve my goal. Thank you for help -- google.com/+arnaudgabourygabx