I just want a way to make these backups, and when restoring, for example, from one laptop to another, move the (updated) backup to the laptop with the outdated Bitcoin folder, without having to delete the blockchain/blocks/database, allowing the updated backup to complement the outdated laptop's database.
If your node isn't running, can't you simply drag & drop the updated blockchain to the other node's database directory? Won't this simply replace the missing files?