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

See if the leftover box still has free memory

The leftover box feels slow. Check free memory before you buy a new mini PC.

The leftover box feels slow. Before you shop for a quiet mini PC, ask how much short-term workspace it still has. Memory (RAM) is that workspace: the leftover box holds running work there. A full disk is different. Disk room is see if the leftover box still has room. This note is memory room.

Skip until SSH works

If ping fails and SSH hangs, start with is the leftover box still on? If you have never logged in from the couch, that is SSH from the couch. This note assumes you can log in from the couch.

What this is

A look, not a shopping trip. Slow can be a full disk, a stuck service, or tight memory. If copies fail, check disk first: see if the leftover box still has room. If a house job quit after a reboot, that is after a reboot, check the leftover box still does its jobs or when something broke, look at the leftover-box log. Here you are only asking whether memory is squeezed.

Ask how much memory is free

SSH in from the couch, then ask:

free -h

free -h prints how much workspace is left, in human sizes (G for gigabytes, M for megabytes). Point at the Mem line. available (or free plus buff/cache on older prints) is what matters for starting new work. If available is tiny (hundreds of MB on an old 4–8 GB leftover laptop) while you run Pi-hole and Samba, the box is squeezed. Do not buy a NAS for this look.

Optional one-liner

If you want a second hint that the leftover box is thrashing:

uptime

Load numbers that stay high with nothing happening can mean the leftover box is swapping hard. Keep this light. You do not need to learn load averages in depth tonight.

If memory is tight

Close heavy extras you added. Do not stack a movie library, a VM, and Pi-hole on a 4 GB leftover laptop. A later leftover-next mini with more RAM is a tiny computer you can leave on, and the RAM shopping rule is buy RAM you can add later; skip soldered 12 GB cubes, when you actually need it. Skip buying RAM sticks for a soldered laptop.

What next

Leave it. Disk room stays see if the leftover box still has room. Weekly habit stays keep the leftover box updated. Skip a new mini PC this morning if available memory is fine. If a house job quit after a reboot, later: see if any house jobs failed to start.

Skip

Skip if SSH fails. That is is the leftover box still on? or SSH from the couch.
Skip a new mini PC for a full disk. Fix disk first: see if the leftover box still has room.
Skip soldered-RAM lottery cubes. That is buy RAM you can add later; skip soldered 12 GB cubes.
Skip a NAS for this look.
Skip Proxmox tonight. That is what a VM is, and when you do not need one.

Sources

Debian: free. Ubuntu: free. Debian: uptime. Ubuntu: uptime. Official pages only. For disk room, see see if the leftover box still has room. For the awake check, see is the leftover box still on?. For the login, see SSH from the couch. A leftover-next mini with more RAM is later: a tiny computer you can leave on and buy RAM you can add later; skip soldered 12 GB cubes.

Also on this topic

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. After a reboot, check the leftover box still does its jobsThe leftover box came back up. Confirm SSH, house ad block, and the file share still work before you buy anything. When something broke, look at the leftover-box logSSH works, but a house job does not. Ask the leftover box what it just said before you buy a monitoring box. A tiny computer you can leave onDo not buy one of these first. Use the old laptop, or a retired OptiPlex from Marketplace. These quiet little PCs are the later buy, when you know you will leave a box on and you want it small and silent.