Linux Container - Proxmox VE
https://pve.proxmox.com/wiki/Linux_ContainerImage based: these are raw images containing a single ext4 formatted file system. ZFS subvolumes: these are technically bind mounts, but with managed storage, and thus allow resizing and snapshotting. Directories: passing size=0 triggers a special case where instead of a raw image a directory is created.
Containers - lxc | Ubuntu
ubuntu.com › server › docsTherefore lxc comes with a special download template, which downloads pre-built container images from a central lxc server. The most important use case is to allow simple creation of unprivileged containers by non-root users, who could not for instance easily run the debootstrap command.