Simple, use this tool to boot a temp recovery session using the CWM option, when recovery boots, choose the "backup and restore" option, create the backup.
Then, if you ever need to restore that backup, use this tool again to launch the temp CWM recovery session, when the recovery boots, choose the "backup and restore" option again, then choose the backup that you made and restore it.
This tool does not allow you to flash the recovery onto the device as other devices do, it only boots a live temporary recovery session without actually flashing the recovery. It can't be flashed on devices that rely on this tool because they have locked bootloaders.
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This recovery cannot always be used to make nandroid backups, as the partition layout that is in the recovery is sometimes incorrect for some devices.