We are in the process of changing a bunch of servers off of a legacy domain to our enterprise domain. The IP's aren't changing, just the FQDN. Will changing the hostname on these devices in Commvault cause the backups to rebaseline? Or will it treat them the same as before?
After they've been moved to the new domain, you'll need to update the hostname for their client objects in the commcell. Once that's done, they should be treated as the same client.