# Incremental data replication - Deploy `TiDB Data Migration (DM)` 

![`smart`](./student-guide/diagram/IncDataReplicaDM_aa_001_20230718.png)

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If you want to migrate incremental data and merge `MySQL` shards to `TiDB Cloud`, you need to manually deploy `TiDB Data Migration (DM)`. For detailed steps, see https://docs.pingcap.com/tidb/stable/deploy-a-dm-cluster-using-tiup
If there is a large amount of data that needs to be incrementally synchronized, it is best to have a number of `DM workers` greater than the number of source data instances to ensure high availability.