I have to restore Hosted Engine on another host (completely new hardware). Based on this https://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self-Hosted_Environment/ is not clear for me if vm's will be rebooted during synchronization hosts with engine ? 

I have 5 hosts + 1 completely fresh. On host1 I have HE and there is no vm's on other 4 (host1-4) there are around 400 vm which can't be rebooted. Host5 for restore HE.