# Disk space

> See what uses disk space, and clean up safely.

Source: https://quasar.achaverot.fr/docs/server/disk/

A full disk is the most common way a VPS goes down. **System** has three sections to keep it in check.

## Docker storage

Shows how much space Docker uses (images, containers, volumes, build cache), and how much of it can be reclaimed.

### Cleaning up

Each category shows the number of items and the space it frees **before** you delete anything. Open a category to see its items, and tick only the ones you want.

A cleanup removes what nothing uses any more:

- images with no container,
- untagged image layers,
- build cache (all or nothing: Docker can't remove part of it),
- containers left over from deployments,
- unused networks.

It **keeps**:

- stopped applications and their images,
- each application's recent Git builds, used for [rollbacks](/applications/logs-history/#rolling-back).

### Orphaned volumes

Volumes that no container uses are offered separately, behind their own checkbox.

:::danger
A deleted volume can't be recovered. Open it first from **Volumes** to check what it holds.
:::

## Volumes

Lists every Docker volume on the server, with its size and the application it belongs to. Orphaned volumes are marked. Click **Browse** to look inside with the [storage explorer](/applications/storage/#the-storage-explorer).

## Application storage

Shows the disk space used by each application's folder. The [Growth chart](/applications/storage/#growth) on an application's page shows how it evolves.