diff --git a/internal/repository/repository_test.go b/internal/repository/repository_test.go
index ecd42c3db..f2ef1d082 100644
--- a/internal/repository/repository_test.go
+++ b/internal/repository/repository_test.go
@@ -4,11 +4,13 @@ import (
 	"bytes"
 	"context"
 	"crypto/sha256"
+	"fmt"
 	"io"
 	"math/rand"
 	"path/filepath"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -487,3 +489,65 @@ func TestNoDoubleInit(t *testing.T) {
 	err = repo.Init(context.TODO(), r.Config().Version, rtest.TestPassword, &pol)
 	rtest.Assert(t, strings.Contains(err.Error(), "repository already contains snapshots"), "expected already contains snapshots error, got %q", err)
 }
+
+func TestSaveBlobAsync(t *testing.T) {
+	repo, _, _ := repository.TestRepositoryWithVersion(t, 2)
+	ctx := context.Background()
+
+	type result struct {
+		id    restic.ID
+		known bool
+		size  int
+		err   error
+	}
+	numCalls := 10
+	results := make([]result, numCalls)
+	var resultsMutex sync.Mutex
+
+	err := repo.WithBlobUploader(ctx, func(ctx context.Context, uploader restic.BlobSaverWithAsync) error {
+		var wg sync.WaitGroup
+		wg.Add(numCalls)
+		for i := 0; i < numCalls; i++ {
+			// Use unique data for each call
+			testData := []byte(fmt.Sprintf("test blob data %d", i))
+			uploader.SaveBlobAsync(ctx, restic.DataBlob, testData, restic.ID{}, false,
+				func(newID restic.ID, known bool, size int, err error) {
+					defer wg.Done()
+					resultsMutex.Lock()
+					results[i] = result{newID, known, size, err}
+					resultsMutex.Unlock()
+				})
+		}
+		wg.Wait()
+		return nil
+	})
+	rtest.OK(t, err)
+
+	for i, result := range results {
+		testData := []byte(fmt.Sprintf("test blob data %d", i))
+		expectedID := restic.Hash(testData)
+		rtest.Assert(t, result.err == nil, "result %d: unexpected error %v", i, result.err)
+		rtest.Assert(t, result.id.Equal(expectedID), "result %d: expected ID %v, got %v", i, expectedID, result.id)
+		rtest.Assert(t, !result.known, "result %d: expected unknown blob", i)
+	}
+}
+
+func TestSaveBlobAsyncErrorHandling(t *testing.T) {
+	repo, _, _ := repository.TestRepositoryWithVersion(t, 2)
+	ctx, cancel := context.WithCancel(context.Background())
+
+	var callbackCalled atomic.Bool
+
+	err := repo.WithBlobUploader(ctx, func(ctx context.Context, uploader restic.BlobSaverWithAsync) error {
+		cancel()
+		// Callback must be called even if the context is canceled
+		uploader.SaveBlobAsync(ctx, restic.DataBlob, []byte("test blob data"), restic.ID{}, false,
+			func(newID restic.ID, known bool, size int, err error) {
+				callbackCalled.Store(true)
+			})
+		return nil
+	})
+
+	rtest.Assert(t, errors.Is(err, context.Canceled), "expected context canceled error, got %v", err)
+	rtest.Assert(t, callbackCalled.Load(), "callback was not called")
+}