Barracuda Networks NG FIREWALL 5.0.3 - Manual (Page 19)

19 Release and Migration Notes - Updating NG Control Center Managed Units
No more interaction with the unit is necessary. Wait until the update is finished. Depending on the
hardware, it will need from 15 minutes on the fastest appliances up to 60 minutes on the flash
appliances.
Take a look into the box log file at Box > Logs > Box\Release\update after the update process has been finished.
In case of a not succeeded update please consult Box\Release\update_hotfix for a detailed log.
Note that when updating a unit, the migration is executed at unit level and not on the Barracuda NG Control Center
itself.