A View Security Server contains no information about the configuration of the View installation, and therefore has no backup requirements. Assuming that the self-signed SSL certificate was replaced with one from a trusted internal or commercial certificate authority, it is important to maintain a backup of that certificate that includes the private key.
As the View Security Server is a publicly accessible server, you may wish to back up the log files on a regular basis. These files are located in the same folder on every type View Connection Server:
Chapter 13, Implementing VMware Horizon View Group Policies, outlines how to change the log configuration settings