nixos/system/impermanence.nix

{ impermanence, ... }:

# Define which files and directories should persist between boots
{
    imports = [ impermanence.nixosModules.impermanence ];

    environment.persistence."/persist" = {
        hideMounts = true;
        directories = [
            "/var/log"
            "/var/lib/bluetooth"
            "/var/lib/networkmanager"
            "/var/lib/nixos"
            "/var/lib/systemd/coredump"
            "/etc/NetworkManager/system-connections"
            "/etc/ssh"
        ];
        files = [
            "/etc/machine-id"
        ];
    };
}