nix/nixos/hosts/nuc-server/disks.nix

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

  services.cron = {
    systemCronJobs = [
      # Back up Local-Storage to NFS Storage
      "*/10 * * * * albert btrfs-backup root"
      "*/10 * * * * albert btrfs-backup nix"
      "*/10 * * * * albert btrfs-backup home"
      "*/10 * * * * albert btrfs-backup Local-Storage"
    ];
   };

  # extra configs not present in the standard config above
  services.snapper.configs.Local-Storage = {
    TIMELINE_CREATE = true;
    TIMELINE_CLEANUP = true;
    TIMELINE_LIMIT_YEARLY    = 1;
    TIMELINE_LIMIT_QUARTERLY = 4;
    TIMELINE_LIMIT_MONTHLY   = 3;
    TIMELINE_LIMIT_WEEKLY    = 4;
    TIMELINE_LIMIT_DAILY     = 7;
    TIMELINE_LIMIT_HOURLY    = 24;
    SUBVOLUME = "/Local-Storage";
  };
  
  services.btrfs.autoScrub.enable = true;
  services.btrfs.autoScrub.interval = "weekly";

  disko.devices.disk.nvme0 = {
    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 = { 
          size = "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
                "/Local-Storage" = {
                  mountpoint = "/Local-Storage";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # Local-Storage
                # 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
                "/Local-Storage/.snapshots" = {
                  mountpoint = "/Local-Storage/.snapshots";
                  mountOptions = [ "compress=zstd" "noatime" ];
                }; # Local-Storage
              }; # subvolumes
            }; # content.content
          }; # content
        }; # partition 2 (/ BTRFS)
      }; # partitions
    }; # content
  }; # disko.devices.disk.nvme0
} # root