A small list for important Proxmox files & directories.


For LXC (Linux containers) :

config: /var/lib/lxc/$ct_id/config

For KVM (Kernel-based Virtual Machine, mostly Windows machines)

config: /etc/pve/qemu-server/$kvm_id.conf

Cluster files (if you use Proxmox cluster)

per node configuration : /etc/pve/nodes/$node_name/*

Location of the ISO files that can then be loaded from the web interface :

/var/lib/vz/template/iso/