ASA5545-X Cluster - database replication

[fachahbar]

We infact implemented configuration as “Avoiding Interrupted Failover and Data Links”

Our failover topology is quite similar to the one below, though we use port channels, instead of physical interfaces.

Can you help me understand how VPN database replication takes place between active & secondary devices.

How can I verify that the database replication is not lagging or missing?

Any special conditions apply for any connect VPN?