How to backup a replica Using mysqldump?

From MySQL Documents , and This answer they said: > When using mysqldump, you should stop replication on the replica before starting the dump process to ensure that the dump contains a consistent set of data: Since my DBs are big, I thought to use --single-transaction --quick to take a snapshot of my DBs and continue to receive data from the master. My question is, what will happen if I do not stop the replica and receive new data during backup time? **Note**: I know --single-transaction take a snapshot, But I want to know if my approach has any disadvantages.