added basic borg backup

modules/borg.nix

@@ -0,0 +1,24 @@
+{ config, ... }:
+{
+  services.borgbackup.jobs.default = {
+    paths = [
+      "/etc"
+      "/home"
+      "/root"
+      "/var"
+    ];
+    exclude = [
+      "*/.cache"
+      "/home/*/build"
+      "/var/log"
+    ];
+    repo = "borg@haus.mc-fucker.cool:/mnt/sdf1/borg/${config.networking.hostName}";
+    compression = "zstd";
+    encryption.mode = "none";
+    environment.BORG_RSH = "ssh -o 'StrictHostKeyChecking=no' -i /root/.ssh/id_borg";
+    extraCreateArgs = "--verbose --stats";
+    startAt = "03:00";
+  };
+}
+
+# vim: set et ts=2 sw=2 ai:

systems/mc3/configuration.nix

@@ -13,6 +13,7 @@
         ./hardware-configuration.nix
         ./modules/generic.nix
         ./modules/invidious.nix
+        ./modules/borg.nix
       ];
 
   #nixpkgs.overlays = [

systems/mc5/configuration.nix

@@ -5,6 +5,7 @@
       ./hardware-configuration.nix
       ./modules/generic.nix
       ./modules/ceph-common.nix
+      ./modules/borg.nix
     ];
 
   services.ceph = {

systems/vpn/configuration.nix

@@ -6,6 +6,7 @@
       ./modules/generic.nix
       ./modules/headscale.nix
       ./modules/ceph-common.nix
+      ./modules/borg.nix
     ];
 
   services.ceph = {