Definition - What does Backup Appliance mean?
It is a type of turnkey and all-inclusive backup solution that provides a central interface for backup processes, tools and infrastructure.
Techopedia explains Backup Appliance
It works by being connected to the devices/ components on the local/ organizational network. The pre-installed backup software captures data / files from each connected and configured node / device and stores it on its local storage media.
The same data can be replicated /restored through the backup appliance when required. It can also be connected to external storage / backup facility such as SAN, NAS or cloud backup.
Moreover, it may also provide data security and protection services by encrypting data at rest and restricing access to the appliance to only authorized users.