Written 27 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

See if the USB backup disk showed up

Before you trust the weekly copy, confirm the leftover box can see the USB disk.

Before you trust a USB backup, confirm the leftover box can see the stick. lsblk lists the leftover box's disks. The USB one usually appears as a new sd… (or nvme… if that is what you plugged in) with a size that matches the stick. Mount means the leftover box made the disk's folder visible so a copy can write there.

Skip until SSH works and one backup is in reach

If you have never logged in from the couch, that is SSH from the couch. If you have never copied the house folder (and are not about to), start with a backup of the leftover-box folder. This note assumes you can log in, and you already did one manual backup once, or you are about to.

What this is

A look, not a shopping trip. Plug the USB disk you already have into the leftover box. Ask whether the leftover box sees it before you blame rsync or buy a NAS. You are not buying a file box, a new enclosure, or a bigger stick tonight.

Ask if the leftover box sees the stick

Plug the USB in. Wait a few seconds. SSH in from the couch, then ask:

lsblk

Point at a new disk line whose SIZE matches the stick, not the tiny system disk. The leftover box's own disk is usually the small one you installed Debian or Ubuntu on. The USB line is the one that showed up after you plugged in. If nothing new appears, try another port or cable, wait a few seconds, and run the same command again. Do not buy a NAS for a missing USB.

Optional clearer print

If you want filesystem labels too (ext4, exfat, and the like):

lsblk -f

That extra column is a name check, not a wipe. Keep this light. Do not partition or format the stick tonight.

If you see it but the backup path failed

The leftover box can see the disk. Confirm the folder you copy into is the mounted USB path from a backup of the leftover-box folder (often /mnt/backup). Then confirm files landed: check that the leftover-box backup actually copied. If the disk is full, that is see if the leftover box still has room.

What next

Manual copy: a backup of the leftover-box folder. Confirm files landed: check that the leftover-box backup actually copied. Weekly timer later: back up the leftover-box folder every week without remembering. Skip a NAS for a missing USB.

Skip

Skip if SSH fails. That is SSH from the couch.
Skip a NAS for a missing USB.
Skip wiping the stick tonight.
Skip buying an enclosure for this look.
Skip Proxmox tonight. That is what a VM is, and when you do not need one.

Sources

Debian: lsblk. Ubuntu: lsblk. Official pages only. For the copy, see a backup of the leftover-box folder. For confirming files landed, see check that the leftover-box backup actually copied. For leftover-box disk room, see see if the leftover box still has room. For the login, see SSH from the couch.

Also on this topic

A backup of the leftover-box folderA second copy of the house folder, on a USB disk you already have, or on another leftover computer. You do not need a NAS for this. Check that the leftover-box backup actually copiedAfter the copy finishes, look on the USB disk and confirm the files are there before you trust it. You do not need a NAS for this look. See if the leftover box still has roomAfter the house folder is working, check that the leftover box is not filling up. Photos stop copying when the disk is full. You do not need a NAS for this look. Back up the leftover-box folder every week without rememberingAfter one manual USB (or second-box) copy works, let the leftover box run the same rsync on a weekly timer. A phone reminder is still fine if you prefer.