fix restic --stdin-filename option

repository_restic.go

@@ -194,7 +194,7 @@ func (r *resticRepository) BackupStream(ctx context.Context, backup Backup, ds D
 		name = fmt.Sprintf("%s/%s", ds.Name, ds.Atoms[0].Name)
 	}
 	return r.shell.Run(ctx, fmt.Sprintf(
-		"%s backup --stdin --stdin-name %s",
+		"%s backup --stdin --stdin-filename %s",
 		r.resticCmd(),
 		name,
 	))