Hello,
When restoring a backup through Web GUI or console, at least the unbound settings are not being restored. The Unbound settings are present in the backup.xml.
Also specifying unbound restore only through the Web GUI does not have any effect.
Other settings that are relevant in my setup seems to have restored properly (Firewall, interfaces,...)
What version is the backup and what version are you running? I had an issue where I was restoring a backup of 22.1.8 to a 22.1 unit before upgrading and it caused issues because of the Unbound changes around version 22.1.4 I believe. I ended up upgrading the unit to latest then restored and did not have any issues.