The Kaseya plug-in for Veeam Backup & Replication was discontinued in 2019 and is no longer available nor supported by Veeam.

Step 3. Install Veeam Backup Add-on

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Install the Veeam Backup Add-on on the Kaseya server:

Log on to the Kaseya server with an account having Local Administrator privileges.
Run the Veeam_B&R_Kaseya.exe installer to start the Veeam Backup & Replication Add-on for Kaseya setup wizard.
Follow the steps of the installation wizard. At the last step, click Install to start the installation process.
After the Veeam Backup Add-on is installed, log off the Kaseya console and log on again.

Check that the Veeam Backup & Replication section is available in the Kaseya navigation pane on the left.