by Ken Task.
In the debug ... "Unknown setting: questionbank".
In the debug, appears new server is missing an addon?
On old server from code/admin/cli/
php uninstall_plugins.php --show-contrib
That will list the addons installed on the old server.
On the new server, install all the addons before attempting
restore of course backups from old server. Might be missing a question type.
In worse case senario, something is wrong with the questionbank for that course on old server thus backups would have those issues.
To see if that's the case install on old server:
https://moodle.org/plugins/tool_health
and run it. Might find issues with the questionbank and those won't be fixed on the fly when restoring to new server. Let's hope that's not the case!
'SoS', Ken