cmMaintCmdSecondaryIpAddr is a read-write IP address for a fallback file server that a maintenance command will use if the primary transfer fails, with the description noting the command's status becomes failed if no secondary is configured and the primary fails, and that this field is ignored entirely for bulkCPEDownload and configRestore. An administrator configures a secondary server as a redundancy measure for commands like configBackup, so a single file-server outage doesn't cause a missed backup. For example, if the primary backup server is temporarily unreachable, having cmMaintCmdSecondaryIpAddr set would let the configBackup still succeed against the fallback server instead of reporting failed.