diff --git a/pkg/compute/models/backup_storage.go b/pkg/compute/models/backup_storage.go
index d2406c43b0..d648e2bf10 100644
--- a/pkg/compute/models/backup_storage.go
+++ b/pkg/compute/models/backup_storage.go
@@ -96,6 +96,12 @@ func (bs *SBackupStorageManager) ValidateCreateData(ctx context.Context, userCre
 		if input.ObjectSecret == "" {
 			return input, httperrors.NewInputParameterError("object_secret is required when storage type is object")
 		}
+		if len(input.ObjectBucketUrlExt) > 0 {
+			_, err := url.Parse(input.ObjectBucketUrlExt)
+			if err != nil {
+				return input, httperrors.NewInputParameterError("invalid object_bucket_url_ext %s: %s", input.ObjectBucketUrlExt, err)
+			}
+		}
 	}
 	return input, nil
 }
@@ -117,6 +123,9 @@ func (bs *SBackupStorage) CustomizeCreate(ctx context.Context, userCred mcclient
 		ObjectBucketUrl: input.ObjectBucketUrl,
 		ObjectAccessKey: input.ObjectAccessKey,
 		ObjectSecret:    input.ObjectSecret,
+
+		ObjectSignVer:      input.ObjectSignVer,
+		ObjectBucketUrlExt: input.ObjectBucketUrlExt,
 	}
 	return bs.SEnabledStatusInfrasResourceBase.CustomizeCreate(ctx, userCred, ownerId, query, data)
 }
@@ -175,6 +184,7 @@ func (bs *SBackupStorage) getMoreDetails(ctx context.Context, out api.BackupStor
 	out.ObjectBucketUrl = bs.AccessInfo.ObjectBucketUrl
 	out.ObjectAccessKey = bs.AccessInfo.ObjectAccessKey
 	out.ObjectSignVer = bs.AccessInfo.ObjectSignVer
+	out.ObjectBucketUrlExt = bs.AccessInfo.ObjectBucketUrlExt
 	// should not return secret
 	out.ObjectSecret = "" // bs.AccessInfo.ObjectSecret
 	return out
@@ -326,6 +336,10 @@ func (bs *SBackupStorage) PostUpdate(ctx context.Context, userCred mcclient.Toke
 			accessInfo.ObjectSignVer = input.ObjectSignVer
 			accessInfoChanged = true
 		}
+		if len(input.ObjectBucketUrlExt) > 0 {
+			accessInfo.ObjectBucketUrlExt = input.ObjectBucketUrlExt
+			accessInfoChanged = true
+		}
 	}
 	if accessInfoChanged {
 		_, err = db.Update(bs, func() error {