Can a user back up the Umbrella Virtual Appliance?
Cisco does not recommend backing up or cloning of Virtual Appliances (VA), as that will result in sync issues when restoring the VAs. The VAs themselves do not cache any data that would require backing up. Users should deploy 2 VAs per site in order to avoid downtime if one of the VAs are out of commission -- these should be configured manually and not cloned or copied. To restore the failed VA, you can remove the VA from the Dashboard and redeploy a fresh one. For information on VA deployment can be found here: Deploy Virtual Appliances