diff --git a/app/Imports/Sheets/DailyChangesSheet.php b/app/Imports/Sheets/DailyChangesSheet.php
index 90b7223..356be9a 100644
--- a/app/Imports/Sheets/DailyChangesSheet.php
+++ b/app/Imports/Sheets/DailyChangesSheet.php
@@ -85,7 +85,7 @@ class DailyChangesSheet implements ToCollection, WithHeadingRow, WithValidation,
     public function rules(): array
     {
         return [
-            'portfolio_id' => ['required'], 
+            'portfolio_id' => ['required', 'uuid'], 
             'date' => ['required', 'date'],
             'total_market_value' => ['sometimes', 'nullable', 'numeric'],
             'total_cost_basis' => ['sometimes', 'nullable', 'min:0', 'numeric'],
diff --git a/app/Imports/Sheets/PortfoliosSheet.php b/app/Imports/Sheets/PortfoliosSheet.php
index bf43d98..015ff05 100644
--- a/app/Imports/Sheets/PortfoliosSheet.php
+++ b/app/Imports/Sheets/PortfoliosSheet.php
@@ -58,7 +58,7 @@ class PortfoliosSheet implements ToCollection, WithValidation, WithHeadingRow, S
     public function rules(): array
     {
         return [
-            'portfolio_id' => ['sometimes', 'nullable'],
+            'portfolio_id' => ['sometimes', 'nullable', 'uuid'],
             'title' => ['required', 'string'],
             'wishlist' => ['sometimes', 'nullable', 'boolean'],
             'notes' => ['sometimes', 'nullable', 'string'],
diff --git a/app/Imports/Sheets/TransactionsSheet.php b/app/Imports/Sheets/TransactionsSheet.php
index e3d21f1..b331830 100644
--- a/app/Imports/Sheets/TransactionsSheet.php
+++ b/app/Imports/Sheets/TransactionsSheet.php
@@ -106,9 +106,9 @@ class TransactionsSheet implements ToCollection, WithHeadingRow, WithValidation,
     public function rules(): array
     {
         return [
-            'transaction_id' => ['sometimes', 'nullable'],
+            'transaction_id' => ['sometimes', 'nullable', 'uuid'],
             'symbol' => ['required', 'string'],
-            'portfolio_id' => ['required'],
+            'portfolio_id' => ['required', 'uuid'],
             'quantity' => ['required', 'min:0', 'numeric'],
             'transaction_type' => ['required', 'in:BUY,SELL'],
             'date' => ['required', 'date'],
diff --git a/tests/0000_00_00_import_test.xlsx b/tests/0000_00_00_import_test.xlsx
new file mode 100644
index 0000000..a58b90c
Binary files /dev/null and b/tests/0000_00_00_import_test.xlsx differ
diff --git a/tests/ImportExportTest.php b/tests/ImportExportTest.php
new file mode 100644
index 0000000..74882a6
--- /dev/null
+++ b/tests/ImportExportTest.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Tests;
+
+use Tests\TestCase;
+use App\Models\User;
+use App\Models\Transaction;
+use Maatwebsite\Excel\Facades\Excel;
+use App\Exports\BackupExport;
+use App\Models\BackupImport as BackupImportModel;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+class ImportExportTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /**
+     */
+    public function test_can_create_exports(): void
+    {
+        Excel::fake();
+
+        $this->actingAs($user = User::factory()->create());
+
+        Transaction::factory(5)->buy()->lastYear()->symbol('AAPL')->create();
+
+        Excel::download(new BackupExport, now()->format('Y_m_d') . '_investbrain_backup.xlsx');
+
+        Excel::assertDownloaded(now()->format('Y_m_d') . '_investbrain_backup.xlsx', function(BackupExport $export) {
+            return true;
+        });
+    }
+
+    /**
+     */
+    public function test_backup_job_completes(): void
+    {
+        $this->actingAs($user = User::factory()->create());
+
+        $backup_job = BackupImportModel::create([
+            'user_id' => auth()->user()->id,
+            'path' => __DIR__.'/0000_00_00_import_test.xlsx'
+        ]);
+
+        $backup_job->refresh();
+
+        $this->assertEquals('success', $backup_job->status);
+    }
+
+    /**
+     */
+    public function test_backup_job_inserts_rows(): void
+    {
+        $this->actingAs($user = User::factory()->create());
+
+        BackupImportModel::create([
+            'user_id' => auth()->user()->id,
+            'path' => __DIR__.'/0000_00_00_import_test.xlsx'
+        ]);
+
+        $this->assertEquals(3, $user->transactions->count());
+    }
+
+    /**
+     */
+    public function test_backup_job_calculates_correct_holding_data(): void
+    {
+        $this->actingAs($user = User::factory()->create());
+
+        BackupImportModel::create([
+            'user_id' => auth()->user()->id,
+            'path' => __DIR__.'/0000_00_00_import_test.xlsx'
+        ]);
+
+        $holding = $user->holdings->first();
+
+        $this->assertEquals('AAPL', $holding->symbol);
+        $this->assertEquals(6, $holding->quantity);
+        $this->assertEqualsWithDelta(233.33, $holding->average_cost_basis, 0.01);
+    }
+}