Consolidated realtime mysql backup with master/slave setup or binlog I have 20+ mysql servers and their have low write requirements. 

So, I want to see if any way I can replicate the data/binlog from these servers to a single slave so realtime backup purpose.

If I have only a single master, then replication is easy, however, in this case, I have 20+. 

Are there any easy way if I don't want to setup 20+ mysql salve on a single server?
Till MySQL 5.6 released version, Multiple master to single slave replication is not possible. This type of replication is under development in MySQL 5.7 version.

you can refer below link:-

MySQL 5.7 Multi-Source-Replication