Asking for advice and personal experiences on cloning / moving servers.

I have a FreeBSD 15 server running Sylve with several virtual machines with services on them. I would like to create a backup / HA server on a different machine. These two servers are completely different equipment, both based on x86 architecture but different CPUs, different hard drive capacities, etc.
I would like to know what's the best course of action to clone my active main server onto the other machine despite their differences. Should I simply install FreeBSD on the server as the hypervisor and then dd the rest of the directories for Sylve and the rest of the applications? Or what is the recommended course of action by people who have gone through this situation?

In other words: I would like to have a standby backup server that I can turn up on demand and/or periodically get's copied with all the info from the main server and then goes back to sleep, since my case scenario forgives one or two days of missing backups/data.

Thank you so very much in advance.
 
Why would you use dd? Simply rsync the VMs over.

Caveat: strictly speaking it isn't safe to copy the underlying raw device of a running machine.
 
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