The current version of ovirt-engine in production environment is 4.3.5.5. In order to prevent the ovirt-engine machine from being down, the management interface cannot be used, according to the relevant link: https://ovirt.org/documentation/admin-guide/chap-Backups_and_Migration.html I backed it up using the command: engine-backup --scope=all --mode=backup --file=file_name --log=log_file_name I have prepared another machine as a spare machine. Once the ovirt-engine is down in the production environment, the standby machine can be UP and the standby machine can manage the ovirt-nodes. According to the relevant links: https://ovirt.org/documentation/install-guide/chap-Installing_oVirt.html The ovirt-engine is installed on the standby machine. After I have executed these three commands: 1. yum install http://resources.ovirt.org/pub/yum-repo/ovirt-release43.rpm 2. yum update 3. yum install ovirt-engine I found that the ovirt-engine version of the standby machine is 4.3.6 So my question is: 1. The ovirt-engine version of the standby machine is 4.3.6, and the production environment ovirt-engine version is 4.3.5.5, which command is used on the production environment ovirt-engine machine: engine-backup --scope=all --mode=backup --file=file_name --log=log_file_name Files obtained after using the backup command on the ovirt-engine in the production environment are restored using these two files under the standby computer. Will the information on the ovirt-engine management interface of the standby computer be consistent with the ovirt-engine of the production environment (eg data center, host, virtual machine, etc.)? 2. Can the ovirt-engine of the standby machine be installed with version 4.3.5.5? How do I need to modify the following three commands to get the backup machine to install the version 4.3.5.5? 1. yum install http://resources.ovirt.org/pub/yum-repo/ovirt-release43.rpm 2. yum update 3. yum install ovirt-engine