init::pools replica addition

app/init.php

@@ -532,6 +532,12 @@ $register->set('pools', function () {
             'multiple' => true,
             'schemes' => ['mariadb', 'mysql'],
         ],
+        'replica' => [
+            'type' => 'database',
+            'dsns' => App::getEnv('_APP_CONNECTIONS_DB_REPLICAS', $fallbackForDB),
+            'multiple' => true,
+            'schemes' => ['mysql'],
+        ],
         'queue' => [
             'type' => 'queue',
             'dsns' => App::getEnv('_APP_CONNECTIONS_QUEUE', $fallbackForRedis),

src/Appwrite/Platform/Tasks/Backup.php

@@ -65,7 +65,7 @@ class Backup extends Action
             try {
                 $attempts++;
                 $pools
-                    ->get('database_' . $database)
+                    ->get('replica_' . $database)
                     ->pop()
                     ->getResource();