private void backupNowAllPackages(boolean nonIncrementalBackup) {
        int userId = UserHandle.USER_SYSTEM;
        IPackageManager mPm =
                IPackageManager.Stub.asInterface(ServiceManager.getService("package"));
        if (mPm == null) {
            System.err.println(PM_NOT_RUNNING_ERR);
            return;
        }
        List<PackageInfo> installedPackages = null;
        try {
            installedPackages =  mPm.getInstalledPackages(0, userId).getList();
        } catch (RemoteException e) {
            System.err.println(e.toString());
            System.err.println(PM_NOT_RUNNING_ERR);
        }
        if (installedPackages != null) {
            List<String> packages = new ArrayList<>();
            for (PackageInfo pi : installedPackages) {
                try {
                    if (mBmgr.isAppEligibleForBackup(pi.packageName)) {
                        packages.add(pi.packageName);
                    }
                } catch (RemoteException e) {
                    System.err.println(e.toString());
                    System.err.println(BMGR_NOT_RUNNING_ERR);
                }
            }
            backupNowPackages(packages, nonIncrementalBackup);
        }
    }