Written 5 Sep 2026. This is a how-to, not a product card.

Mount the backup USB automatically

Leave the backup stick plugged in and mount it at boot by UUID, so weekly rsync finds /mnt/backup without a hand mount. You don't need a NAS.

Haven't formatted the stick yet? Start with format a USB stick for the house backup. One manual copy still missing? That is a backup of the house folder. This note is only for after a hand mount already worked, and you want the same stick to show up at /mnt/backup after a reboot (or before the weekly timer).

Skip until a hand mount already worked

If you have never mounted this stick and run rsync once, stop. Fix that first. Don't edit /etc/fstab to "make backup work" when the stick is still blank or the path is wrong. Prefer another old PC instead of a stick that stays plugged in? That path is copy the house folder to another old computer.

What this is

One line in /etc/fstab that mounts the backup partition by its UUID at /mnt/backup when the computer boots. Device letters like sdb1 can move when you plug another disk. The UUID stays. nofail means a missing stick will not hang the boot. You still unplug the stick into a drawer most weeks if that is your habit — unplug the backup USB safely covers sync and umount before you yank. Automatic mount is for the weeks the stick stays in the computer so a timer can find it.

Step 1: awake, then SSH

Power light. Fan. If it looks asleep, start with is the computer still on?. You need SSH from the couch: SSH from the couch. Connect fails? when SSH won't connect.

Step 2: plug the stick in and read its UUID

Plug in the same spare stick you already formatted (often labeled HOUSEBAK). Wait a few seconds. Print labels and UUIDs:

lsblk -f

Or:

sudo blkid

Find the USB partition (match SIZE and the HOUSEBAK label if you set one). Copy the UUID=… value for that partition. Use the UUID from your printout, not a sample from a blog. Fuller look at stable names: see stable disk names by UUID. Stick not listed? see if the USB backup disk showed up.

Step 3: make the mount folder

Same path the backup notes use:

sudo mkdir -p /mnt/backup

If it is already mounted from a hand test, unmount once so the fstab check is clean:

sudo umount /mnt/backup

Harmless if it was not mounted.

Step 4: add one fstab line (with nofail)

Open the file:

sudo nano /etc/fstab

Add a single new line at the bottom. Swap in your real UUID:

UUID=YOUR-UUID-HERE /mnt/backup ext4 defaults,nofail 0 2

Save and exit nano (Ctrl+O, Enter, Ctrl+X). Do not delete the lines that were already there. Those mount the system disk. Wrong UUID or a typo on the system line can make the next boot painful. nofail is the safety valve for a USB that is sometimes unplugged.

Step 5: test the mount before you reboot

Ask the computer to mount everything in fstab that is not already up:

sudo mount -a

Confirm the stick is at the path:

findmnt /mnt/backup

You should see a line with /mnt/backup and your UUID (or the device it points at). Check the landing folder still exists for rsync:

ls /mnt/backup/share

If that folder is missing, recreate it and hand ownership back:

sudo mkdir -p /mnt/backup/share && sudo chown "$USER:$USER" /mnt/backup/share

If mount -a errors, fix the fstab line before any reboot. Common mistakes: wrong UUID, missing nofail, or a space where the UUID should be one block.

Step 6: optional reboot check, then the weekly timer

Reboot when you can afford a minute:

sudo reboot

SSH back in and run findmnt /mnt/backup again. It should remount alone. After that, a weekly timer can find the path without you typing mount: back up the folder every week without remembering. Mount fails after a reboot, or rsync still cannot see the stick? When the house backup won't run.

What this is not

This is not a reason to leave the only backup stick plugged in forever so one bad day can wipe both copies. It is not RAID. It is not a NAS. It is not automount for random thumb drives you borrow. It is not editing the system-disk lines in fstab. It is not a substitute for one successful hand rsync.

What next

Run or re-check the copy: a backup of the house folder. Confirm files landed: check that the backup actually copied. Drawer habit instead of leaving it in: unplug the backup USB safely. Let the computer do it weekly: back up the folder every week without remembering. Stick still blank or Windows-formatted? Format a USB stick for the house backup. Prefer a second old PC: copy the house folder to another old computer.

Skip

• Skip until a hand mount and one rsync already worked.
• Skip editing the existing system-disk lines in /etc/fstab.
• Skip a bare /dev/sdb1 line. Use the UUID.
• Skip leaving out nofail if you sometimes unplug the stick.
• Skip buying a NAS so a stick can remount.
• Skip cloud backup until a plain second copy exists on a stick or another old PC.