How to create mirror of mysql database for switching purpose in case of emergency?

I have around 400 GB Live mysql Databases on one server and I like to create a mirror for this database. In the server I have database ranging from 1 GB to 100 GB. What are the best practices available that I can use? My purpose is that I should be able to switch in case of emergency. It should have all live data.

Thanks.

From stackoverflow

• It depends on the emergency...

  For live data, replication is the way to go, but an accidental DROP will be replicated straight across...

  Also, are you looking to survive a building disaster, or just a server/drive/hardware crash?

  stepancheg : DROP is not a problem if you make full daily backups and store replication logs since backup.

  aartist : Thank you for the answer. I am looking to survive both. Once I can have copy, then I can move the replicated server to a new location and possibly use rsync to get up to date for building disaster.

  Greg : You need 2 forms of security: redundancy (RAID, replicated server) and backups. They'll protect you from two different types of emergency.