Add localbackup clan service

clanServices/localbackup/README.md

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+## Features
+
+- Creates incremental snapshots using rsnapshot
+- Supports multiple backup targets
+- Mount/unmount hooks for external storage
+- Pre/post backup hooks for custom scripts
+- Configurable snapshot retention
+- Automatic state folder detection
+
+## Usage
+
+Enable the localbackup service and configure backup targets:
+
+```nix
+instances = {
+  localbackup = {
+    module.name = "@clan/localbackup";
+    module.input = "self";
+    roles.default.machines."machine".settings = {
+      targets.external= {
+        directory = "/mnt/backup";
+        mountpoint = "/mnt/backup";
+      };
+    };
+  };
+};
+```
+
+## Commands
+
+The service provides these commands:
+
+- `localbackup-create`: Create a new backup
+- `localbackup-list`: List available backups
+- `localbackup-restore`: Restore from backup (requires NAME and FOLDERS environment variables)