nixos-server: add borg backup

hosts/shared/nixos-server.nix

@@ -17,30 +17,6 @@ in
   };
 
   services = {
-    snapper = {
-      snapshotInterval = "hourly";
-      cleanupInterval = "1d";
-      configs = {
-        home = {
-          SUBVOLUME = "/home";
-          TIMELINE_CREATE = true;
-          TIMELINE_CLEANUP = true;
-          TIMELINE_LIMIT_HOURLY = "10";
-          TIMELINE_LIMIT_DAILY = "7";
-          TIMELINE_LIMIT_WEEKLY = "2";
-          TIMELINE_LIMIT_MONTHLY = "0";
-          TIMELINE_LIMIT_YEARLY = "0";
-          BACKGROUND_COMPARISON = "yes";
-          NUMBER_CLEANUP = "no";
-          NUMBER_MIN_AGE = "1800";
-          NUMBER_LIMIT = "50";
-          NUMBER_LIMIT_IMPORTANT = "10";
-          EMPTY_PRE_POST_CLEANUP = "yes";
-          EMPTY_PRE_POST_MIN_AGE = "1800";
-        };
-      };
-    };
-
     avahi = {
       enable = true;
       nssmdns4 = true;
@@ -205,6 +181,7 @@ in
       devenv
       jump
       weather
+      borgbackup
       openjdk
       openjdk17
       openjdk25