add buffer to btrbk

hosts/nasbackup/hardware-configuration.nix

@@ -51,7 +51,7 @@
   };
 
   services.btrbk = {
-      extraPackages = [ pkgs.lz4 ];
+      extraPackages = [ pkgs.lz4 pkgs.mbuffer ];
       instances = {
           hf = {
               onCalendar = "hourly";
@@ -78,6 +78,7 @@
           bak = {
               onCalendar = "weekly";
               settings = {
+	          stream_buffer = "265m";
                   stream_compress = "lz4";
                   incremental = "yes";
                   snapshot_create = "no";
@@ -114,33 +115,6 @@
                   };
               };
           };
-#          lf = {
-#              onCalendar = "daily";
-#              settings = {
-#                  incremental = "yes";
-#                  snapshot_create = "ondemand";
-#                  snapshot_dir = "@snapshots";
-#                  timestamp_format = "long";
-#
-#                  snapshot_preserve = "2m 2w 5d";
-#                  snapshot_preserve_min = "latest";
-#                
-#                  volume =  {
-#                      "/mnt/snapshots/Pluto" = {
-#                          snapshot_create = "always";
-#                          subvolume = {
-#                            "@" = {};
-#                            "@/Backups" = {};
-#                            "@/Games" = {};
-#                            "@/IT" = {};
-#                            "@/Media" = {};
-#                            "@/Pictures" = {};
-#                            "@/Rest" = {};
-#                          };
-#                      };
-#                  };
-#              };
-#          };
       };
   };