feat: adds bare borg-backup service for violet

hosts/violet/backups.nix

@@ -0,0 +1,54 @@
+let
+  borgbackupMonitor =
+    {
+      config,
+      pkgs,
+      lib,
+      ...
+    }:
+    with lib;
+    {
+      key = "borgbackupMonitor";
+      _file = "borgbackupMonitor";
+      config.systemd.services =
+        {
+          "notify-problems@" = {
+            enable = true;
+            serviceConfig.User = "liv";
+            environment.SERVICE = "%i";
+            script = ''
+              ${pkgs.curl}/bin/curl -d "$SERVICE FAILED! - service $SERVICE on host $(hostname) failed, run journalctl -u $SERVICE for details."
+            '';
+          };
+        }
+        // flip mapAttrs' config.services.borgbackup.jobs (
+          name: value:
+          nameValuePair "borgbackup-job-${name}" {
+            unitConfig.OnFailure = "notify-problems@%i.service";
+          }
+        );
+
+      # optional, but this actually forces backup after boot in case laptop was powered off during scheduled event
+      # for example, if you scheduled backups daily, your laptop should be powered on at 00:00
+      config.systemd.timers = flip mapAttrs' config.services.borgbackup.jobs (
+        name: value:
+        nameValuePair "borgbackup-job-${name}" {
+          timerConfig.Persistent = true;
+        }
+      );
+    };
+
+in
+{
+  imports = [ borgbackupMonitor ];
+  services = {
+    borgbackup.jobs.liv-violet = {
+      paths = "/home/liv";
+      encryption.mode = "none";
+      environment.BORG_RSH = "ssh -i /home/liv/.ssh/id_ed25519";
+      repo = "ssh://liv@100.115.178.50:9123/spinners/rootvol/backups/hosts/violet";
+      compression = "auto,zstd";
+      startAt = "daily";
+    };
+  };
+}