Please follow the instructions in the Appliance Setup Guide to perform the initial network configuration of the new appliance.
Verify the version that the new appliance is running. If the version is lower than the current version of your other Cluster Members, you will need to upgrade the new appliance, prior to enrolling it in the Cluster.
NOTE: It is recommended to always match the version of the Desktop Client you are using with the version of the Appliance. You can download the setup file for the Desktop Client by logging into the web interface of the Appliance. You can also use this URL: https://IPofSafeguard/safeguard.msi. If you have a newer Client version installed, you will need to uninstall it first, then install the older version.
If the new appliance is running an SPP 2.X version, you will need to first apply the "Safeguard for Privileged Passwords 2.11.2 Upgrade Pre-Requisite" patch to upgrade it to 2.11. Then apply the "One Identity Safeguard for Privileged Passwords 6.0 LTS Physical Appliance Patch". Once your are upgraded to 6.0, you can upgrade to the latest LTS or Feature release from there.
Once the initial setup has been completed, enroll the new appliance into your Cluster as a Replica. Wait for it to synchronize the data from the other appliances. The length of time required will depend on the amount of data and the speed of the connection between the Cluster Members.
Once everything is synchronized, you can Promote a different Cluster Member to the Primary role if you prefer.
If you need to completely rebuild your Cluster by restoring from a backup, please consult the KB below.