It is not portable, if it is tied to one specific drive. That's by definition the exact opposite of being "portable" 😅
I don't believe this is the case but maybe I misunderstood something. 🤔 When you drive fails, you have to use some process that requires Limetech to be around & alive to get a new license - even though it does not have to be a human interaction if you don't need more that 1 license change a year. And if they are not around or their infrastructure goes down, you are SoL because you cannot get even the "trial" license anymore and your device will just refuse to start up. So either you would have to figure out how to mount your drives on vanilla system (don't know if that is possible) or somehow crack the Unraid (unnecesarily painful if you already paid for your license).
That is my main concern, it needlessly ties consumable hardware (USB disks are a consumable) and its whole functionality.
The second concern is that if a developer is willing to unnecesarily create a system of useless hoops users have to jump through in a name of some protection, it (usually) means that they invested quite a lot of time in that instead of investing it into something that would truly make users life easier 😁 I've seen this few times already: product itself was not bad, but the hoops you had to jump through were bananas.
One company did tie their license to NTFS drive ID of C:/ for example - that was fun as we intended to run the whole setup in a VM. Other did tie MAC addresses to its license - for VM appliances. 🤦
This sounds interesting - it means that I can have another USB disk plugged in & there is a live (atleast somewhat, does not have to be realtime really) backup so I can boot from that and get my system fully up & running if the primary fails and I have no network? That would atleast partially address some of my concerns about having USB disk as a primary system device. 🙂