What was included in a backup determined by backup preferences chosen by admins. Teachers could also override by stepping through the backup process to and selecting/deselecting what to include in the backup.
If backups were automated there is no indication in the backup file name but if backup preferences were set to 'no user' then one will see a 'nu' in the backup file name.
Does your entity have a full site backup of server - code, DB dump, and moodledata? If they do, you might be able to install on local PC - perhaps best if in same environment, however. It's easy to spin up stuff if entity using virtualized servers.
With a clone one can change the backup preferences etc., etc. for the backups such that *everything* pertaining to that course is included - that's if modules contained in the course had backup included in code (you haven't said what version of moodle).
Doubt, BTW, that if that data exist, it will be easy to import into other LMS.
And I am curious also .... what LMS is your entity moving to?
'spirit of sharing', Ken