Architecting a VMware NSX Solution : Recoverability : 9.2 NSX Controller Recoverability
   
9.2 NSX Controller Recoverability
There is an NSX Controller snapshot button in the user interface to take NSX Controller cluster snapshots. A snapshot is the database snapshot of the controller cluster. Take NSX Controller snapshots at the same time as the NSX Manager backup. Before taking the snapshot backup, verify the following:
All of the controllers are in the normal state.
The cluster has formed a majority (quorum).