Hi Tim! Changing the backend while a machine is running can have unexpected results, sorry for not being clear about that on my previous message. Moreover, VM’s are not preserved when you change the backend. For your use case, I think using libvirt is better because it lets you fine-control through a GUI or terminal your VM. If you want to stick to qemu anyway, you can find config files under /var/snap/multipass/common, but I warn you that this may change at any moment. (Caveat emptor: manually modifying the files there is not advised because it can result in data loss.)