I don’t know that it that specific, PDF is widely used for printing at least where I’ve ordered from.

My one complaint is you can’t export to PDF and it has no print function to use a PDF converter either…

Regardless of VM or LXC, I would only install docker once. There’s generally no need to create multiple docker VMs/LXCs on the same host. Unless you have a specific reason; like isolating outside traffic by creating a docker setup for only public services.

Backups are the same with VM or LXC on Proxmox.

The main advantages of LXC that I can think of:

• Slightly less resource overhead, but not much (debian minimal or alpine VM is pretty lightweight already).
• Ability to pass-through directories from the host.
• Ability to pass-through hardware acceleration from a GPU, without passing through the entire GPU.
• Ability to change CPU cores or RAM while it’s running.