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

Clear old leftover-box logs when the disk is tight

Before you buy a bigger drive or a NAS, see how much room the leftover-box diary is using, then trim old entries safely.

The leftover box keeps a diary of what programs said. That diary can grow for months. When the disk is tight and /var looked big, this is a safe trim. You are not buying a bigger drive, a NAS, or a monitoring box for this.

Skip until you looked at disk room

If you have not checked room yet, stop. That look is see if the leftover box still has room. If you want to see which folders are taking the room, that is see which leftover-box folders are eating the disk. Clear leftover package downloads first if you have not: clear old package downloads when the leftover disk is tight. From the couch, ask:

df -h

Point at the line that ends in /. If Use% is fine, skip this note. If phones and laptops cannot open the house folder, fix that first: when the house share disappeared, check the leftover box.

What this is

journalctl is the Debian and Ubuntu tool that reads the leftover-box diary. The same tool can tell you how big that diary is, and trim old pages. You are keeping recent words. You are not deleting the house folder, Pi-hole, or Samba. You are not installing a log app.

See how big the diary is

SSH in from the couch, then ask:

journalctl --disk-usage

You should see a line like Archived and active journals take up X. A few hundred megabytes is common on a leftover box that has been on for weeks. A few gigabytes is worth trimming. If the number is tiny, skip the rest of this note.

Trim old entries

Keep about two weeks of diary, and drop older pages:

sudo journalctl --vacuum-time=14d

Or cap the diary at a size you pick (200 megabytes is a sensible leftover-box ceiling):

sudo journalctl --vacuum-size=200M

Pick one. You do not need both tonight. Recent errors stay. Months-old noise goes. Do not run random rm under /var/log.

Check again

Ask about the diary size once more:

journalctl --disk-usage

Then look at disk room:

df -h

The longer look is still see if the leftover box still has room. If you need to read a current error, that is when something broke, look at the leftover-box log. Do not buy a NAS because old diary pages filled a leftover laptop.

What next

Package download cleanup stays clear old package downloads when the leftover disk is tight. Folder hunters stay see which leftover-box folders are eating the disk. A second copy is a backup of the leftover-box folder. Skip a new 4TB drive this weekend.

Skip

• Skip this note if disk room is fine.
• Skip this note if the diary size is already tiny.
• Skip a NAS for this look.
• Skip a new internal drive this weekend.
• Skip deleting /var, /var/log, or /srv/share by hand.
• Skip installing a log or monitoring app tonight.