WFM Data Aggregator supports hot-standby high availability. You can install a second Data Aggregator server as a backup and configure it to take over automatically if the primary server goes down.
The backup reads the same information as the primary Data Aggregator, so if it is necessary to switch to the backup, there is no delay or loss of data. At the transition, the backup Data Aggregator simply starts writing to the database, beginning where the primary Data Aggregator left off.
WFM Server supports warm-standby high availability. You can configure WFM Server as a primary/backup pair and if the primary server goes down, the client servers (WFM Web, WFM Data Aggregator, and WFM Builder) can connect to the backup WFM Server, acting as primary. See Connect to Backup WFM Server.