configured backups for the nuc

hosts/nuc/default.nix

@@ -6,6 +6,7 @@
       # Include the results of the hardware scan.
       ./hardware-configuration.nix
       ./modules/networks
+      ./modules/backup
       ./modules/nextcloud
       ./modules/vaultwarden
       ./modules/nginx

hosts/nuc/modules/backup/default.nix

@@ -0,0 +1,39 @@
+
+{
+  fileSystems."/mnt/backup" =
+    {
+      device = "/dev/disk/by-uuid/f6905cdb-c130-465a-90a3-93997023b5d3 ";
+      fsType = "btrfs";
+      options = [ "compress=zstd" "noatime" ];
+      neededForBoot = false;
+    };
+
+  fileSystems."/mnt/pool" =
+    {
+      device = "/dev/disk/by-uuid/16b0bd14-1b07-477d-a20d-982f9467f6df";
+      fsType = "btrfs";
+      options = [ "compress=zstd" "noatime" ];
+    };
+  
+  services.btrbk = {
+    instances."nuc-to-disk".settings = {
+      snapshot_preserve = "14d";
+      snapshot_preserve_min = "2d";
+      target_preserve = "30d 4w 12m";
+      target_preserve_min = "2d";
+      volume = {
+        "/mnt/pool" = {
+          subvolume = {
+            log = {
+              snapshot_create = "always";
+            };
+            lib = {
+              snapshot_create = "always";
+            };
+          };
+          target = "/mnt/backup/nuc";
+        };
+      };
+    };
+  };
+}