IMHO the OSI is right, the designation "open source" should be reserved for those models that are actually open source (including training data). And apparently there are a few models that actually meet this criterion: "Though none are confirmed, the handful of models that Bdeir told MIT Technology Review are expected to land on the list are relatively small names, including Pythia by Eleuther, OLMo by Ai2, and models by the open-source collective LLM360." (https://www.technologyreview.com/2024/08/22/1097224/we-finally-have-a-definition-for-open-source-ai/)
Perhaps it would also be useful to have a name for models that release their weights under an OSI license, maybe "open weight"? However, this model would not even meet that... (same for Llama).
If you don't want to reinstall the OS, you can probably use Clonezilla: https://clonezilla.org/show-live-doc-content.php?topic=clonezilla-live/doc/03_Disk_to_disk_clone
Maybe you need to update the drive ids for your bootloader (grub) afterwards, not sure about that.