Labthrift Labthrift What to buy. What to skip. Why.

Written 28 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

See what the leftover box already runs on a schedule

Before you add a weekly backup or buy a monitoring box, look at the leftover box alarm clocks with systemctl list-timers.

A leftover OptiPlex from Marketplace may already have leftover weekly jobs: a copy to someone else's folder, a cleanup, or a name you do not recognize. A timer is the leftover box's alarm clock. Look first. You are not buying a monitoring box, and you are not adding your own weekly copy yet.

Skip until SSH works

If you cannot log in from the couch, stop. That is SSH from the couch. This note assumes you can type commands on the leftover box from the couch. If the leftover box clock still looks like UTC, set the house zone first: set the leftover box clock to your house. NEXT and LAST only make sense on the house clock.

Skip if you just installed a fresh OS

If this weekend you wiped the leftover box and installed Debian or Ubuntu Server, you will mostly see the usual house-keeping names. Skip this note until you add your own weekly copy. The install path is what OS to put on the leftover box. This look is for a box that already had someone else's Linux on it, or for the look right before you add a timer.

What this is

A timer is a schedule Debian and Ubuntu already use. systemctl list-timers prints the alarm clocks that are armed. This is not the same note as back up the leftover-box folder every week without remembering (that is you adding a timer) or see if any house jobs failed to start (that is a job that already broke). You are only reading the list.

Ask for the alarm clocks

SSH in from the couch, then ask:

systemctl list-timers

Point at three columns. NEXT is when it will run. LAST is when it last ran. UNIT is the name. A short list of familiar names is normal. A name you have never heard of, on a Marketplace box, is the leftover job.

Usual leftover-box names you can leave alone: apt-daily, apt-daily-upgrade, logrotate, man-db, fstrim, systemd-tmpfiles-clean, e2scrub, motd-news. Those are weekly or daily house-keeping. Do not turn them off tonight.

Optional longer list, if you also want timers that are written down but not armed:

systemctl list-timers --all

If a name looks leftover

Do not disable a name you do not recognize on day one. Write it down. Ask the leftover box what that job just said: when something broke, look at the leftover-box log. If the leftover box feels busy at a regular hour, that is see what is keeping the leftover box busy. A leftover copy that fills the disk is still see if the leftover box still has room, not a new NAS.

Optional leftover cron

Some leftover office boxes still use cron, the older alarm-clock list, instead of a timer. If systemctl list-timers only showed the usual names and the leftover box still does something at a regular hour, ask:

crontab -l

No crontab for you is fine. Then the system leftover list:

ls /etc/cron.d

Names you already know from the timer list can wait. A file named after a person, a coin, or a folder you do not use is the leftover. Do not delete it tonight. Read it later, after SSH and a backup you trust are boring.

What next

The house clock stays set the leftover box clock to your house. After one manual copy worked, add your own weekly job: back up the leftover-box folder every week without remembering. Weekly fixes stay keep the leftover box updated, or later let the leftover box apply weekly fixes without you. Skip a camera. Skip a monitoring box for this look.

Skip

Sources

Debian: systemctl (list-timers). Ubuntu: systemctl. Debian: crontab. Official pages only. For the house clock, see set the leftover box clock to your house. For adding your own weekly copy, see back up the leftover-box folder every week without remembering. For a job that already broke, see see if any house jobs failed to start. For the login, see SSH from the couch.

Also on this topic

Set the leftover box clock to your houseLogs, updates, and weekly backups only make sense if the leftover box uses your local time. timedatectl sets the city zone. The box keeps the clock correct over the network. 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. See if any house jobs failed to startAfter a reboot, check failed units before you blame the network or buy a new box. Let the leftover box apply weekly fixes without youAfter the weekly two-command habit is boring, you can let the leftover box apply those same fixes by itself. Skip this until that habit is boring. Do not let it reboot on its own. 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.