Running one instance of SpanVA, makes it a Single Point of Failure. Having a valid and updated user accounts is very critical especially for the Gatelet users.
There are a few options provided by most of the virtual infrastructure like taking snapshots of the VM, or Cloning it. Though they may need some level to manual intervention.
This article provides a suggestion on how to configure multiple live SpanVA instances to address the fault tolerance and high availability requirements in an Active-Active topology.
On-Prem SpanVA with Active Directory Sync configured.
Two SpanVA instances with the exact mirrored configuration can run parallel to each other with a reasonable lag time (1 hour or so) so that each one of them will run each other Sync Cycle.
SpanVA instance 1: runs AD Sync at: 8 AM, 10 AM , 12 PM , 2PM ..etc
SpanVA instance 2: runs AD Sync at: 9 AM, 11 AM, 1 PM , 3 PM ..etc
if one of them fail, the Sync rate will be reduced by half (or Sync period will be doubled) but the service won't be lost.