For each node of the cluster, you have a license that enables installation of Agent for Exchange.
The Exchange writer for VSS is turned on.
You downloaded the setup program of Acronis Backup Advanced.
You have a machine running Windows that will act as the management server. The management server enables configuring of Exchange cluster backup.
You have a machine running 64-bit Windows that will act as the storage node. The storage node serves as storage for backups of other machines and enables deduplication. Make sure this machine meets the system requirements described in the installation documentation.