Repositories migration from one NXRM OSS 3 to another NXRM OSS 3

I have repositories in nexus oss 3 and now want to migrate these repository data to another nexus oss 3 for migrating client data from nexus one location to another. I have searched many articles but couldn’t find any relevant article. Prepare a Backup , Backup and Restore any other idea like ansible or shell script???