I'm upgrading Backup Exec 16 server to BE 20.3 Will the backups run against a Windows 2008 R2 server that has not had the agent upgraded yet. I can squeeze the BR upgrade in during the day mid-week but it's difficult to get a window to reboot the file server after the agent upgrade until Sunday morning. Frequently the agent upgrade requires a reboot.
In prior versions you could run against a downlevel agent, just got warnings.
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I've recently updated from BE 2014 to 20.3. The old 2014 agents still work. The jobs finish with exceptions, informing you that the agents are out-of-date.
I recently updated from 16 to 20, I pushed out the updated agents straight away but left the reboots for our scheduled Windows updates reboots. All my jobs ran without issue.