private File getBackupDirForMember(final File rootDir, final CharSequence memberId) {
    File[] dateDirs = rootDir.listFiles((FileFilter) DIRECTORY);
    assertThat(dateDirs).hasSize(1);

    File[] memberDirs =
        dateDirs[0].listFiles(file -> file.isDirectory() && file.getName().contains(memberId));
    assertThat(memberDirs).hasSize(1);

    return memberDirs[0];
  }
Verifies that a user deployed jar file is included as part of the backup.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/backup/IncrementalBackupIntegrationTest.java