tasks/backup-archive: migrate as ni's host-specific module

In practice, this is only used by it.

hosts/ni/default.nix

@@ -32,6 +32,7 @@
       setup = "networkmanager";
       wireguard.enable = true;
     };
+    services.backup.enable = true;
     setups = {
       desktop.enable = true;
       development.enable = true;

hosts/ni/modules/default.nix

@@ -4,6 +4,7 @@
     ./hardware/qol.nix
     ./networking/setup.nix
     ./networking/wireguard.nix
+    ./services/backup
     ./setups/desktop.nix
     ./setups/development.nix
     ./setups/gaming.nix

hosts/ni/modules/services/backup/default.nix

@@ -2,7 +2,8 @@
 { config, lib, pkgs, ... }:
 
 let
-  cfg = config.tasks.backup-archive;
+  hostCfg = config.hosts.ni;
+  cfg = hostCfg.services.backup;
 
   borgJobCommonSetting = { patterns ? [ ], passCommand }: {
     compression = "zstd,12";
@@ -42,12 +43,12 @@ let
   pathPrefix = "borg-backup";
 in
 {
-  options.tasks.backup-archive.enable =
+  options.hosts.ni.services.backup.enable =
     lib.mkEnableOption "backup setup with BorgBackup";
 
   config = lib.mkIf cfg.enable {
     sops.secrets = lib.getSecrets
-      (lib.getSecret "backup-archive.yaml")
+      ./secrets.yaml
       (lib.attachSopsPathPrefix pathPrefix {
         "patterns/home" = { };
         "patterns/etc" = { };

modules/nixos/default.nix

@@ -29,7 +29,6 @@ let
     ./profiles/i18n.nix
     ./profiles/server.nix
     ./profiles/vpn.nix
-    ./tasks/backup-archive
     ./tasks/multimedia-archive
   ];
 in

modules/nixos/tasks/backup-archive/README.adoc

@@ -1,5 +0,0 @@
-= BorgBackup setup for the archive
-
-It's a NixOS configuration that configures my basic BorgBackup backup battlestation for my local archive.
-Not all of the required files are here (i.e., the SSH key used for Borg).
-In other words, if it's not yours, don't attempt to activate this setup.