nix/nixos/hosts/nixos-framework/disks.nix

{
  imports = [ ../../common/services/snapper.nix ];

  services.cron = {
    systemCronJobs = [
      "0 17 * * * root sudo btrfs-backup root"
      "0 17 * * * root sudo btrfs-backup nix"
    # "0 17 * * * root sudo btrfs-backup home"
    ];
   };

  services.btrfs.autoScrub.enable = true;
  services.btrfs.autoScrub.interval = "weekly";

  boot.resumeDevice = "/dev/mapper/ROOT";
  # https://sawyershepherd.org/post/hibernating-to-an-encrypted-swapfile-on-btrfs-with-nixos/ 
  boot.kernelParams = [ "resume_offset=533760" ];

  disko.devices.disk.nvme0n1 = {
    type = "disk";
    device = "/dev/nvme0n1";
    content = {
      type = "gpt";
      partitions = { 
        BOOT = {
          priority = 1;
          name = "BOOT";
          start = "0%";
          end = "550MiB";
          type = "EF00";
          content = {
            type = "filesystem";
            format = "vfat";
            # https://github.com/nix-community/disko/issues/527 
            mountOptions = [ "umask=0077" ];
            mountpoint = "/boot";
          };
        }; # partition 1 (ESP)
        LUKS-ROOT = {
          start = "550MiB";
          end = "100%";
          content = {
            type = "luks";
            name = "ROOT";
            extraOpenArgs = [ "--allow-discards" ];
            content = {
              type = "btrfs";
              extraArgs = [ "-f" ];
              subvolumes = {
                "/root" = {
                  mountpoint = "/";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # root
                "/home" = {
                  mountpoint = "/home";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # home
                "/nix" = {
                  mountpoint = "/nix";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # nix
                # SNAPSHOT SUBVOLS
                "/root/.snapshots" = {
                  mountpoint = "/.snapshots";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # root
                "/home/.snapshots" = {
                  mountpoint = "/home/.snapshots";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # home
                "/nix/.snapshots" = {
                  mountpoint = "/nix/.snapshots";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # nix
                # Swap partition
                "/swap" = {
                  mountpoint = "/swap";
                  swap.swapfile.size = "64G";
                }; # swap
              }; # subvolumes
            }; # content.content
          }; # content
        }; # partition 2 (/ BTRFS)
      }; # partitions
    }; # content
  }; # disko.devices.disk.nvme0
} # nix