Relax And Recover for os level backups. https://relax-and-recover.org/

With rear you can back up your system to pretty much anything. Mounted volume, USB drive, even to a bootable iso.

I use weekly rear backups for my system, and hourly Borg backups for diffs/point in time restore of user data, but you could use rear for an entire system snapshot as well.

Managing a legally procured library of media. Piracy is not the only way to get digital music, movies, and books.

Export controls or legal compliance, most likely. Export controls because the code may be a protected technology, or compliance because the company doesn’t have gdpr or some other legal framework.

REAR Relax-and-Recover will do entire system point-in-time snapshot backups to a bootable iso or physical USB thumb drive: https://relax-and-recover.org/rear-user-guide/index.html

I use rear for backing up my root, and Borg for packing up user data (for versioning, file recovery), but you can use rear for the entire system too.

You could use a python script with oathtool copied onto each of your devices. This is not a good suggestion.