diff --git a/app/Models/ScheduledDatabaseBackupExecution.php b/app/Models/ScheduledDatabaseBackupExecution.php
index eb43a1a2e3..a11c581d9b 100644
--- a/app/Models/ScheduledDatabaseBackupExecution.php
+++ b/app/Models/ScheduledDatabaseBackupExecution.php
@@ -3,12 +3,13 @@
 namespace App\Models;
 
 use App\Traits\HasS3Replicas;
+use App\Traits\RecordsWorkerHost;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class ScheduledDatabaseBackupExecution extends BaseModel
 {
-    use HasS3Replicas;
+    use HasS3Replicas, RecordsWorkerHost;
 
     protected static function booted(): void
     {
diff --git a/app/Models/ScheduledTaskExecution.php b/app/Models/ScheduledTaskExecution.php
index 8f496fc1e6..c5f1f393f7 100644
--- a/app/Models/ScheduledTaskExecution.php
+++ b/app/Models/ScheduledTaskExecution.php
@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Traits\RecordsWorkerHost;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use OpenApi\Attributes as OA;
 
@@ -22,6 +23,8 @@ use OpenApi\Attributes as OA;
 )]
 class ScheduledTaskExecution extends BaseModel
 {
+    use RecordsWorkerHost;
+
     protected $fillable = [
         'scheduled_task_id',
         'status',
diff --git a/app/Models/ScheduledVolumeBackupExecution.php b/app/Models/ScheduledVolumeBackupExecution.php
index 82dfe0ee3b..776b2b24fc 100644
--- a/app/Models/ScheduledVolumeBackupExecution.php
+++ b/app/Models/ScheduledVolumeBackupExecution.php
@@ -3,12 +3,13 @@
 namespace App\Models;
 
 use App\Traits\HasS3Replicas;
+use App\Traits\RecordsWorkerHost;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class ScheduledVolumeBackupExecution extends BaseModel
 {
-    use HasS3Replicas;
+    use HasS3Replicas, RecordsWorkerHost;
 
     protected $fillable = [
         'uuid',
diff --git a/app/Traits/RecordsWorkerHost.php b/app/Traits/RecordsWorkerHost.php
new file mode 100644
index 0000000000..ac55770b65
--- /dev/null
+++ b/app/Traits/RecordsWorkerHost.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Traits;
+
+use Illuminate\Database\Eloquent\Builder;
+
+/**
+ * Stores the host that created the execution, so a host can count only the runs of its own workers.
+ * The host name is internal, so API and MCP responses do not show it.
+ */
+trait RecordsWorkerHost
+{
+    protected static function bootRecordsWorkerHost(): void
+    {
+        static::creating(function (self $execution): void {
+            $execution->worker_host ??= gethostname();
+        });
+    }
+
+    protected function initializeRecordsWorkerHost(): void
+    {
+        $this->hidden[] = 'worker_host';
+    }
+
+    /**
+     * Rows without a host were created before the column existed, so they can belong to this host.
+     */
+    public function scopeOnThisHost(Builder $query): Builder
+    {
+        return $query->where(fn (Builder $query) => $query->where('worker_host', gethostname())->orWhereNull('worker_host'));
+    }
+}
diff --git a/bootstrap/helpers/shared.php b/bootstrap/helpers/shared.php
index cd78aeee34..b31756dae9 100644
--- a/bootstrap/helpers/shared.php
+++ b/bootstrap/helpers/shared.php
@@ -2936,20 +2936,20 @@ function isAnyDeploymentInprogress(bool $showAll = false)
 }
 
 /**
- * Counts scheduled task, database backup, and volume backup runs that are still running.
+ * Counts scheduled task, database backup, and volume backup runs that are still running on this host.
  * A run that started longer ago than its job timeout is stale: the worker has stopped it.
  */
 function runningScheduledJobCount(): int
 {
     $startedWithin = fn (Model $execution, int $timeoutSeconds): bool => $execution->created_at?->gt(now()->subSeconds($timeoutSeconds)) ?? false;
 
-    $tasks = ScheduledTaskExecution::with('scheduledTask')->where('status', 'running')->get()
+    $tasks = ScheduledTaskExecution::with('scheduledTask')->onThisHost()->where('status', 'running')->get()
         ->filter(fn (ScheduledTaskExecution $execution) => $startedWithin($execution, ($execution->scheduledTask?->timeout ?? 300) + ScheduledTaskJob::WORKER_TIMEOUT_MARGIN_SECONDS));
 
-    $databaseBackups = ScheduledDatabaseBackupExecution::with('scheduledDatabaseBackup')->where('status', 'running')->get()
+    $databaseBackups = ScheduledDatabaseBackupExecution::with('scheduledDatabaseBackup')->onThisHost()->where('status', 'running')->get()
         ->filter(fn (ScheduledDatabaseBackupExecution $execution) => $startedWithin($execution, ($execution->scheduledDatabaseBackup?->timeout ?? 3600) + DatabaseBackupJob::WORKER_TIMEOUT_MARGIN_SECONDS));
 
-    $volumeBackups = ScheduledVolumeBackupExecution::with('scheduledVolumeBackup')->where('status', 'running')->get()
+    $volumeBackups = ScheduledVolumeBackupExecution::with('scheduledVolumeBackup')->onThisHost()->where('status', 'running')->get()
         ->filter(fn (ScheduledVolumeBackupExecution $execution) => $startedWithin($execution, $execution->scheduledVolumeBackup?->timeout ?? ScheduledVolumeBackup::DEFAULT_TIMEOUT));
 
     return $tasks->count() + $databaseBackups->count() + $volumeBackups->count();
diff --git a/database/migrations/2026_10_28_204953_add_worker_host_to_scheduled_job_executions.php b/database/migrations/2026_10_28_204953_add_worker_host_to_scheduled_job_executions.php
new file mode 100644
index 0000000000..b90a9eb1c8
--- /dev/null
+++ b/database/migrations/2026_10_28_204953_add_worker_host_to_scheduled_job_executions.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    private const TABLES = ['scheduled_task_executions', 'scheduled_database_backup_executions', 'scheduled_volume_backup_executions'];
+
+    public function up(): void
+    {
+        foreach (self::TABLES as $table) {
+            Schema::table($table, function (Blueprint $table) {
+                $table->string('worker_host')->nullable();
+            });
+        }
+    }
+
+    public function down(): void
+    {
+        foreach (self::TABLES as $table) {
+            Schema::table($table, function (Blueprint $table) {
+                $table->dropColumn('worker_host');
+            });
+        }
+    }
+};
diff --git a/tests/Feature/RunningScheduledJobCountTest.php b/tests/Feature/RunningScheduledJobCountTest.php
index 37edc5d6bc..17cf9423eb 100644
--- a/tests/Feature/RunningScheduledJobCountTest.php
+++ b/tests/Feature/RunningScheduledJobCountTest.php
@@ -64,3 +64,20 @@ it('does not count running rows older than their job timeout', function () {
     $this->travel(60)->minutes();
     expect(runningScheduledJobCount())->toBe(0);
 });
+
+it('records the worker host on new runs and hides it from responses', function () {
+    $execution = ScheduledTaskExecution::create(['scheduled_task_id' => $this->task->id, 'status' => 'running']);
+
+    expect($execution->fresh()->worker_host)->toBe(gethostname())
+        ->and($execution->toArray())->not->toHaveKey('worker_host');
+});
+
+it('counts only runs on this host and runs without a recorded host', function () {
+    ScheduledTaskExecution::create(['scheduled_task_id' => $this->task->id, 'status' => 'running']);
+    (new ScheduledTaskExecution(['scheduled_task_id' => $this->task->id, 'status' => 'running']))->forceFill(['worker_host' => 'other-host'])->save();
+    (new ScheduledDatabaseBackupExecution(['scheduled_database_backup_id' => $this->databaseBackup->id, 'database_name' => 'db', 'status' => 'running']))->forceFill(['worker_host' => 'other-host'])->save();
+    $this->volumeBackup->executions()->make()->forceFill(['worker_host' => 'other-host'])->save();
+    $this->volumeBackup->executions()->create()->forceFill(['worker_host' => null])->save();
+
+    expect(runningScheduledJobCount())->toBe(2);
+});