nix collect-garbage, comrade! there’s also another command to clean up older generations. if you’re using git to version your nix config, you only really need to keep two generations: the current, and your last successful boot, since you can recover by git checkout.

look into NixOS! there might already be a package for it. and NixOS can be very good about not duplicating dependencies.

fun fact: Windows uses 9p for bridging the Windows and Linux filesystems with WSL2. the devs had excellent taste in protocols.