docs(backups): add multi-destination S3 planning notes (#11789)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

app/Actions/Development/StartDevelopmentInstanceDatabase.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Actions\Development;
+
+use App\Models\Server;
+use Lorisleiva\Actions\Concerns\AsAction;
+
+/**
+ * Starts a `coolify-db` container on a development VM that acts as the localhost server.
+ *
+ * The instance backup reads the credentials from this container and dumps it, like on a self-hosted install.
+ * The real development database runs on the host, so the VM cannot reach it.
+ */
+class StartDevelopmentInstanceDatabase
+{
+    use AsAction;
+
+    public function handle(Server $server): void
+    {
+        $environment = collect([
+            'POSTGRES_USER' => config('database.connections.pgsql.username'),
+            'POSTGRES_PASSWORD' => config('database.connections.pgsql.password'),
+            'POSTGRES_DB' => config('database.connections.pgsql.database'),
+        ])->map(fn ($value, string $key): string => '-e '.escapeshellarg("{$key}={$value}"))->implode(' ');
+
+        instant_remote_process([
+            'if ! docker inspect coolify-db >/dev/null 2>&1; then',
+            "docker run -d --name coolify-db --restart unless-stopped {$environment} postgres:15-alpine",
+            'fi',
+            'docker start coolify-db',
+        ], $server, disableMultiplexing: true);
+    }
+}