hosts: nasbak: add remote btrbk

hosts/nasbackup/hardware-configuration.nix

@@ -49,6 +49,7 @@
   };
 
   services.btrbk = {
+      extraPackages = [ pkgs.lz4 ];
       instances = {
           hf = {
               onCalendar = "hourly";
@@ -72,6 +73,39 @@
                   };
               };
           };
+          bak = {
+              stream_compress = "lz4";
+              onCalendar = "weekly";
+              settings = {
+                  incremental = "yes";
+                  snapshot_create = "no";
+                  snapshot_dir = "@snapshots";
+                  timestamp_format = "long";
+
+                  snapshot_preserve_min = "all";
+                  target_preserve_min = "no";
+                  target_preserve = "4w 2m";
+
+                  ssh_identity = "/etc/btrbk/ssh/id_ed25512_btrbk";
+                
+                  volume =  {
+                      "ssh://jupiter.home.opel-online.de/mnt/snapshots/Mars" = {
+                          target = "/mnt/nas/Backups/nas/Mars";
+                          subvolume = {
+                              "@nas" = {};
+                          };
+                      };
+                  };
+                  volume =  {
+                      "ssh://jupiter.home.opel-online.de/mnt/snapshots/Pluto" = {
+                          target = "/mnt/nas/Backups/nas/Pluto";
+                          subvolume = {
+                              "@" = {};
+                          };
+                      };
+                  };
+              };
+          };
 #          lf = {
 #              onCalendar = "daily";
 #              settings = {