Backup farm and Sharepoint SQL dbs that can't be overwritten

I have a backup Farm B. It's not clustered/AlwaysOn at this point, just a farm set up similarly to our primary Farm A. In the event of a catastrophic outage, one consideration is to restore snapshot volumes from Farm A to the Farm B's sql server (naturally database file locations would need to match in both farms).

I know that SharePoint_Config can't be overwritten, as it has settings associating it with Farm A. Which other sharepoint dbs do I need to consider? _AdminContent? The site collection content DBs should be fine.