Do I need a separate Advanced Archiving license for multiple appliances deployed in one location?
This article provides details on Advanced Archiving licensing when deploying multiple appliances at a single site
Each Unitrends appliance (physical or virtual) utilizing Advanced Archiving (archiving to NAS, SAN, or Tape) will need to be licensed for that function. If there is a need to have multiple appliances at one location, and each appliance needs to perform Advanced Archiving, then you will need to purchase a separate Advanced Archiving license for each appliance. This is not a per site license.