# Log Servers for HA

Installing additional Log Servers ensures that system monitoring continues if one Log Server fails.

CAUTION:
The logs are not copied between the Log Servers. To back up log data, set up an Archive Log Task to copy log data from the Log Server to some other location.

Alert escalation proceeds normally, new logs can be browsed, and the engine status and statistics can be examined. However, the log data is not automatically replicated between the Log Servers, so some log data is always unavailable during outages. We recommend that you select the same Log Server for all engines in the same location. If different engines send events to different Log Servers, it is not possible to correlate events, as none of the Log Servers see all events.

Any Log Server can be used both as the main Log Server for some components and as a backup Log Server for one or more other Log Servers. However, consider the load of the Log Servers before you set up a Log Server as a backup Log Server, to avoid overloading when failover occurs.

You can set up additional Log Servers with normal Log Server licenses. A separate license for each Log Server is required, even if the Log Server is used only as a backup.

You can install a new Log Server that works as a backup for another Log Server. You can also set existing Log Servers to be used as backups for another Log Server.