# 灾备任务约束与限制
为保障数据灾备任务的正常运行，针对不同的链路，DRS在使用上存在一定的约束与限制。
- [MySQL到MySQL单主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_04_0122.html)
- [MySQL到TaurusDB单主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_04_0123.html)
- [DDM到DDM单主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_04_0124.html)
- [TaurusDB到TaurusDB单主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_03_1119.html)
- [MySQL到MySQL双主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_04_0127.html)
- [TaurusDB到TaurusDB双主灾备](https://support.huaweicloud.com/realtimedr-drs/drs_04_0129.html)