You are welcome! The Guix installer has Btrfs support, so you can use the partitioner in the installer to get set up. I (and others) have found that part of the

You are welcome! The Guix installer has Btrfs support, so you can use the partitioner in the installer to get set up. I (and others) have found that part of the installer in general to be a bit brittle, best to use the most up to date version and/or do the partitioning by hand (same as eg Arch install). I'd recommend asking any questions in the #guix IRC channel as there are quite a few of us that use Btrfs. I had done a manual install for other reasons anyway, but it should work just find from the installer, no extra steps. And as you can see in my config, in the end you just declare the file system and partitions/subvolumes. Since it is Guix, it is all that one file for the system. (You could use that file to write a live bootable USB image of that system, or initialize a new install directly with that file. Since I have some nonguix and additional channels it requires slightly more, but that is the idea of a system like Guix.)