You can restore BMR boot servers if you protect them as BMR clients. First, back them up. Then use a shared resource tree on another boot server that contains the resources to rebuild the protected boot server.
If a boot server is installed on the same system as the NetBackup master server, you cannot protect it as a BMR client. You can recover the NetBackup catalogs (which include the BMR databases) on the NetBackup master server. However, you must reinstall the NetBackup and BMR software on the master server.
For more information, see the disaster recovery procedures in the NetBackup Troubleshooting Guide.