Server is running out of disk space

[doomilation]

Hi all, it seems that my instance is running out of space and I can't find the culprit.
I have only a Nextcloud instance with less than 10mo + a Scaleway S3 storage.
All the backups are done on this S3.

[
  {
    "filesystem": "udev",
    "size": 1011658752,
    "used": 0,
    "available": 1011658752,
    "capacity": 0,
    "mountpoint": "/dev"
  },
  {
    "filesystem": "tmpfs",
    "size": 208662528,
    "used": 1175552,
    "available": 207486976,
    "capacity": 0.01,
    "mountpoint": "/run"
  },
  {
    "filesystem": "/dev/vda1",
    "size": 19446636544,
    "used": 18454663168,
    "available": 82026496,
    "capacity": 1,
    "mountpoint": "/"
  },
  {
    "filesystem": "tmpfs",
    "size": 1043300352,
    "used": 0,
    "available": 1043300352,
    "capacity": 0,
    "mountpoint": "/dev/shm"
  },
  {
    "filesystem": "tmpfs",
    "size": 5242880,
    "used": 0,
    "available": 5242880,
    "capacity": 0,
    "mountpoint": "/run/lock"
  },
  {
    "filesystem": "tmpfs",
    "size": 1043300352,
    "used": 0,
    "available": 1043300352,
    "capacity": 0,
    "mountpoint": "/sys/fs/cgroup"
  },
  {
    "filesystem": "/dev/vda15",
    "size": 103227392,
    "used": 124928,
    "available": 103103488,
    "capacity": 0.01,
    "mountpoint": "/boot/efi"
  }
]

It doesn't seem to be docker neither :

TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              10                  9                   3.474GB               1.33GB (38%)
Containers          10                  9                   0B                      0B
Local Volumes    42                  18                  1.323GB             2.809MB (0%)
Build Cache         0                   0                   0B                       0B

[nebulon]

How large is the storage at / on the server? I am not 100% sure about the units there, but it looks like it has 20Gb of storage. If that is the case then the base system itself will already occupy a large chunk of it, adding the docker images and some data like from nextcloud itself can easily add up to 20Gb then, which btw is the bare minimum for Cloudron.

[doomilation]

@nebulon Hi. Yes, indeed, the instance has 20gb. I deleted files from trash in Nextcloud and got back to normal with 6gb of free space.