You need to remove some log files and also unused kernels
apt-get remove `dpkg --list 'linux-image*' |grep ^ii | awk '{print $2}'\ | grep -v \`uname -r\``source: https://docs.cloudron.io/troubleshooting/
and:
Use ncdu to browse every container
My results:
Gained 1gb of storage by deleting /usr/local/share/.cache/yarn/ on a container volume
Gained 500mb of storage by deleting Anaconda distribution package cache within a container volume
source: https://forum.cloudron.io/topic/4604/disk-space-should-never-bring-a-whole-server-down/46?_=1708028984619