szubtsovskiy

Вам поможет rowSpan. В примере я засунул данные в state, но вы продолжайте брать из props:

render() {
    return (
      <table>
        <tbody>
          <tr>
            {new Array(8).fill(0).map((el, i) => <th key={i}>TEXT</th>)}
          </tr>
        </tbody>
        <tbody>
          {this.state['vmBackup']['clouds'].flatMap(cloud => {
            return cloud.shards.map(shard => {
              const jobCount = shard['jobs'].length;
              return shard['jobs'].map((job, i) => {
                if (i == 0) {
                  return (
                    <tr key={i}>
                      <td rowSpan={jobCount}>{cloud['cloud']}</td>
                      <td rowSpan={jobCount}>{shard['repository']}</td>
                      <td rowSpan={jobCount}>{shard['repository_size_gb']}</td>
                      <td>{job['job']}</td>
                      <td>{job['job_description']}</td>
                      <td>{job['backup_name']}</td>
                      <td>{job['backup_size_gb']}</td>
                      <td>5</td>
                    </tr>
                  )
                } else {
                  return (
                    <tr key={i}>
                      <td>{job['job']}</td>
                      <td>{job['job_description']}</td>
                      <td>{job['backup_name']}</td>
                      <td>{job['backup_size_gb']}</td>
                      <td>5</td>
                    </tr>
                  )
                }              	
              })
            })
          })}
        </tbody>
      </table>
    )
  }