The average Linux VM I run is around 50-100MB of RAM usage. Not actually that much more than an LXC container.

There are some use cases for a VM over a container, sometimes you want better isolation (my public facing webserver runs in one), or a different OS for some reason (I run an OSX VM because its the only way to test a site in Safari).

Ok that is a very low usage. Alpine or so?

But yeah I just restrict my webserver in an unprivileged container. Though my site is static and accepts no input whatsoever.

Just a basic Debian install.

Containers also have some advantages for device passthrough, I have my Intel iGPU added into one for Immich and Frigate, can't do that with a VM unless you detach the whole GPU from the system.

Backing up entire VMs with all the configuration in case an update breaks something or just bricks your server is a smart idea aswell as running stuff in containers. Also, 4GB per VM? Besides sometimes you need to run software that is not avaliable on linux.

If you backup the entire VM you are just backing up the Linux kernel itself and all the (GNU) tools with it.

Seems like a waste to me.

Backup your docker config and your data, that's what you actually need. The rest is just available online if you ever need it.

>Besides sometimes you need to run software that is not available on linux.

Really, like what?

Good backup software deduplicates on storage. Proxmox backup server for example.

Not all server executables for video games are avaliable on linux for example. There is a lot of use cases and just saying "you just need X" is somewhat of an ignorant statement. No, I don't.